There’s a reason why nobody ever took gunblade or ravenous hunter on him, which both give the same effect when it comes to his ult. It’s because his ult only does incremental amounts of true damage, hence only dealing *enough* or *just* over the amount of health needed to execute. Hence, against a real champion, Urgot’s ult doesn’t actually heal *that* much.
I see there is quite some misinformation, judging by: https://boards.na.leagueoflegends.com/en/c/gameplay-balance/XiQiGXs8-hotfix-needed-deaths-dance-heals-for-15-of-even-true-dmg-insert-urgot-ult
And so I felt this should be cleared up.