More like truth.
When a game developer consistently makes great games and has that one outstanding game that puts them on the map, they gain a reputation. This reputation makes fans and even those who are not yet fans interested in their other projects due to consistency, even if they are not familiar with the IP itself. Divinity Original Sin 2 put Larian on the map, which is now seeping over to their next game.
They gained so much attention and praise for it from all kinds of gamers, that no matter what their next game was gonna be it was going to gain a lot of interest. Their Divinity Original Sin Fallen Heroes was highly anticipated, but then put on hiatus. Many were hoping that DOS3 was coming, but instead it was BG3. So no matter what game was coming up next, it was going to gain a lot of interest no matter what, because it is Larian and people love Larian RPGs and want more great experiences.
So feel free saying that the game is successful mostly because of its name, but it's actually a dead franchise brought back to life after so many years and riding on Larian's reputation, not the other way around. I don't think any other studio would garner the same amount of interest.
Otherwise if it was as influential as you claim it to be, then the official
Baldur's Gate - Siege Of Dragonspear Expansion would have gained more traction than it did in its six and a half years of existence. Compare those 766 reviews of the "actual Baldur's Gate intended experience" to 49396 reviews for Baldur's Gate 3 in its unfinished Early Access state or 132552 reviews for Divinity Original Sin 2. The numbers are so astronomically far apart it's not even funny comparing the two.
So it has very little to do with the name. BG3 is a high quality modern RPG with many impressive aspects and modern gameplay, which is why it's successful. Could have been any name, it would be just the same as it's the next modern Larian RPG.
