Let me refresh your memory:
Witcher 3
RDR1/2
Portal 1/2
Half-life 2
Bioshock
MGS1/2/3
Disco Elysium
Witcher 3 - Didn't finish it. Hated the combat.
RDR1/2 - Ok, I'll give you RDR2. It comes real close. But I feel the weight of TLoU exceeds that of RDR2. Red Dead and its characters are like caricatures of the West. TLoU is more grounded, and feels more plausible. But that's no slight against RDR2. I love that game, and I love the story. If TLoU is my #1, then RDR2 is my #2 and, given my mood, they could conceivably flip. But not today.
Portal 1/2 - Great games, but neither of them have much of a story. A psychotic AI (and sociopathic Cave Johnson) cracks wise while you solve puzzles. That's it. Oh, and I seem to recall a completely abandoned cliffhanger...
Half-life 2 - Meh, alien invasion. Intriguing setup, with oppressive and frightening elements, but it doesn't carry the emotional weight, or the ambivalent morality, of TLoU.
Bioshock - Been too long (close to 20 years?), so I can't comment with confidence, but from what I remember, it gets major points for originality, and I remember the big twist, but it was never something I would consider a real-life possibility, whereas TLoU is, which gives it more weight.
MGS1/2/3 - No clue. Never played 2 or 3, and it's been aeons since I played (and never finished) 1. But from what I've seen of cutscenes over the years, I'm highly skeptical of this claim.
Disco Elysium - Never played it.