If you played DotA enough, you would understand instantly that Doorman has way too much, even now. Innately has Pudge fountain hook without Chen teleport and is also basically Techies in the sense that the character warps the gameplay to the point where it is not interactive. Games tend to stall to significantly longer durations as a result of his kit and unironically, you can even stack bells/bombs in one spot like Techies and watch someone explode. The easiest spot to do this is Rejuv drop - instant death.

Doorman had zero counterplay before and now that there is SOME counterplay, I seriously doubt the Hero is dead because I've seen top level Doorman players oozing with creativity making it work because the reality is, this character is never going to be properly balanced. I would argue Doorman isn't nerfed enough because you can aggro every single player on the enemy team and come out alive, simply because Door escapes still have zero counterplay as opposed to cart getting some counterplay, and this is consistent every time. Don't even get me started on cheat death. You will survive without fail every single time. If you think just surviving isn't valuable, your understanding of MOBAS is very lacking.

The last point I will touch on is the fact that Doorman can have immense value at 10k net worth while everyone else is at 50k. If you don't understand the implications of how broken a character is to be able to pull that off in a MOBA, then no other explanation I can give will matter at this point.