Yasuo gets tanky?

They dont.

Something more was going on, like the yorick being utter trash, or the yasuo having a lot more than tabi.

Tabis are broken More news at 11

Lol just checked your game and it's exactly how I expected.

Yasuo was 13-9 by the end of the game and you were 2-9, so I assume he was 2-3 levels ahead of you whenever that fight occurred.

Yasuo had tabi which gives decent amount of armor that reduces your overall damage as well as 10% additional reduced damage from your autos and Qs. Yasuo had PD which gives 12% overall damage reduction. Yasuo have has passive shield which makes him quite tanky at the beginning of a fight and considering he had his double crit core + some lifesteal it'd look like you're not damaging him at all which I assume what did happen.

Idk much about Yorick but if you failed to shut down yasuo as a top lane bruiser and let him reach his double crit core + some hp/armor items he'd steamroll you easily unless you play a skirmisher that outscales him.

I don't see the issue here really.

Yasuo is not tanky at all. He has ranged character's stats and scalings. He probably had more than a Tabi, possibly a PD and some Life Steal.

Anyway, if you could post the match it would allow us to give you an accurate answer!