Yes, they always film multiple endings with each finalist being crowned, so that Ru and production are the only ones to know the winner until it airs. I've seen videos from both the AS3 and S10 finale viewings, and you can tell from both Trixie's and the 4 S10 finalists' reactions that they legitimately had no idea who the winner was going to be (in the case of the proper seasons, filmed in front of a full audience, it also helps to stop leaks of who won).
Obviously the AS4 finale is a mishmash of the two "crownings", and it comes off as looking totally ridiculous. I guess saying "we need to film you both getting crowned at the same time" would make it a bit obvious to the contestants about what was going on (or maybe Ru's decision for a joint crowning came after-the-fact), but it's all total shenanigans as far as I'm concerned.
Thank you! I thought the exact same thing. $100,000 isn't a small amount, no way did someone think "hey, let's just grab some more money and crown both of them".
I did see a funny joke on Twitter though, that the S11 reveal was so cheap because RuPaul gave all the money away.