Yeah, I also had issues with that video, what I watched of it anyway. Much like you, I haven't experienced most of the glitches that people claim to see. I don't think I've seen an NPC disappear once. Is the NPC AI amazing? No, not really, I especially hate how they all crouch down on the street if you fight somebody and then get stuck in that crouched position, you would think that some would run screaming or something. But some of the things he is expecting for the AI are just unrealistic, like a full daily routine for NPC's in a game the size of Cyberpunk that makes use of NPC randomization. Basically only Rockstar and Bethesda do NPC's with routines that I can think of, and Bethesda games have less than 1/10th the number of NPC's that there are in Cyberpunk, while RDR2's budget was more than twice Cyberpunk; RDR2 is basically a AAAA game, Cyberpunk is a mere AAA, people shouldn't be going in with AAAA expectations for it.
Some of the things that CD Projekt talked about in early demos like the deep romance system and car customization CD Projekt said in later interviews had been cut from the game, so it's not really fair to say that they lied about those features, lots of devs talk about features early development that later get cut due to lack of time or an inability to make them work within the games budget. This isn't a No Man's Sky like scenario where the game released without half the features that Hello Games promised for it, without the devs telling people that the game wouldn't release with those features beforehand.
He was playing on PC and also referenced the PlayStation version, which has much less NPC action going on. Maybe on PC it is tied to whatever CPU you are running, and the NPC's disappear/cars pop in randomly depending on the load on your hardware. Or maybe it's just in a particular area where he was filming, idk. But I haven't seen any of that in my version. I have seen numerous videos of the cars popping in, maybe they were on an older version and it's been fixed in an update. I haven't had time to play as much as I'd like.
My problems with the game so far don't have shit to do with bugs or glitches. I think those have been blown way out of proportion. My issues are some of the AI elements and the RPG elements being mostly cosmetic, or fake. At least in terms of dialogue and story paths. I think some of that stuff is pretty lame, how none of your choices really matter in the end. I'd much prefer something like New Vegas or even Witcher 3 where your dialogue options and choices made actually make a difference. The only big difference I have read about in the game is that if you pick to be a dude, you can't shack up with Judy. That's about it.
But other areas are super deep and RPG like, so idk what went on during development, maybe they just got too ambitious and ran out of time for what they wanted to incorporate. At the end of the day, maybe that's a good thing. I mean look at RDR2, they clearly had all the time they wanted to flesh out every single element and every single system in the game that they wanted. And while the end result was certainly impressive (still easily the most impressive game ever made imho), it didn't make it very fun to play. I have my hands full trying to figure out crafting and hacking, maybe it's good that the other stuff doesn't exist.