Why does this Tank Galio Strat seem OP?

This is my Galio strategy. I am in Gold btw not high elo but I don’t consider myself bad. And midlane

Any Ap midlaner I insta lock Galio, also consider Viktor or Veigar are picked every time it feels. My whole strategy evolves around keeping my laner not fed while I farm at 10 Cs a minute. I build hallow radiance first and my laner just cannot kill me. I feel l

Build:

Dorian’s ring Hallow radiance-situation boots(merc or steel)- frozen heart mana item- thorn mail- back to complete frozen heart, and then it’s situational from there. The point is in build 0 damage.

The play: tell support to play stun engage ie: Leona or naut for example and the second them engage I ult onto them and front line while doing damage with passive.

I know this is gold but I have like a 75 win rate with this strat and only issue comes when my ADC is missing a chromosome.

I feel like 0-0 tank Galio has much more influence then 0-0 viktor for example pre 20 minutes as well.