Does Urgot ult bypass death passives?

Simply put, new Urgot's ult does not bypass anything and does not prevent anything that would normally proc from doing so.

nope

I think a Rioter posted that their passives would still go off, but I'd have to find the source to confirm.

I'm more interested in if it can execute Trynd during his ult, anyone protected by Kindred's ult, or Kayle's or Taric's, etc.

Apparently, some of the Rioters have been fighting for making Urgot's ult "True death" that bypasses any and all protection like revive passives/actives or Tryn ult.

However, they're not likely to get the idea through, so currently, the advantage goes to the defender.