What are your approaches to communication across lightyears in SpaceTime?

I've completely done away with my world's linear understanding of time. I've done extensive research on time, how humanity conceptualized it, and how we interact with it and measure it. In my world, time isn't real per se; it's more a mental model of organizing consciousness and perception that is specific to humans. I got the idea from studying sundials, water clocks, digital clocks, and our most sophisticated atom clocks. Sundials measure the sun's shadow, not time; water clocks measure the flow of water, not time; digital clocks count numbers, not time; even atom clocks measure the vibration of atoms. The arbitrary intervals of all these physical phenomena we call time are a human invention to organize our observation of the change that occurs when we perceive these phenomena. For example, we saw the sun's shadow and designated twelve intervals to it on a sundial. It's plausible to divide it even further into intervals that are a factor or multiple of 12, and it wouldn't lose its function. So I asked, what if human intelligent life developed on a twin sun planet? Our understanding of time would be completely different. Sundials, the foundational time concept for humanity, wouldn't function the same - two suns would form overlapping shadows on a sundial we designed on Earth, and the "time scale" would be a lot more complicated than I can imagine (It would be like having two different readings of time for each sun that overlap at certain moments). In my world, one of the things that separate species and their advancement levels is temporal relativity. Humans call their temporal experience time, but other species have a different name for it and a completely unique understanding that is specific to their planet (Environment, i.e., twin suns/no sun, etc. - how would they measure the change in physical phenomena where they live?) and perception (which is dependent on physiology - if human beings didn't perceive the world with their eyes, how would they have formed a temporal understanding?). When it comes to FTL, any intelligent species that has arrived at that level understands temporal relativity and the fact that the past and future do NOT exist; the past is gone, and the future is yet to come. The only REAL thing is the present moment and the actions that occur within it. FTL communication, in my world, means you just receive information in your present moment and send it in your present moment. The recipient receives information in their present moment that is different from yours due to dilation (which is, in fact, not time per se but the oscillation of atoms being affected by gravity and motion, making them move slower the closer you approach the speed of light so any temporal measurement appears slower to an observer, whether its time or something else) The consequences of Einstein's relativity only become real when the two communicators share a present moment together, i.e., the differences from the change in physical phenomena like age become apparent. In my FTL communication framework, I use tachyons—hypothetical particles always traveling faster than light—to embody the idea that "different present moments" can be linked, bypassing the illusion of linear causality. Tachyons don’t connect past and future but enable communication across "present moments" in spatially distant regions. The idea of "traveling backward in time" (a paradox in human terms) doesn’t exist because the receiving end operates within its own present. Tachyons "sense" spatial distances instantly because, in their natural framework, space and tempor (the universal name for temporal understanding by all species) are unified as a single present reality. Messages encoded in tachyonic fields ride this framework, instantly syncing one distant present to another. Different intelligent species with unique temporal understandings develop tachyon-based communication systems tailored to their perception of the present. The tachyon network requires protocols to account for differing sensory and cognitive frameworks of temporal experience and distance. Universal constants & shared symbols among species (like prime numbers) mediate the translation. Tachyons are naturally abundant in regions of spacetempor (spacetime*) where the linear concept of time "breaks down," i.e., black holes, and are harvested in tachyon farms at event horizons.