Exactly. If they wanted a different game, they shouldn't have use the title Baldur's Gate 3. If it's going to play differently ala 4 party characters, turn-based and main focus was primarily co-op/multiplayer/DM/online they could really call it something else. Baldur's Gate Online, Baldur's Gate Turn-Based tactics, etc. Not to mention there's no continuation to the story of earlier baldur's gate. So using the title 3 here was primarily gathering attention and to gain press coverage. It seems really a disgrace and cheap advertisement. Possibly under instruction from WoTC though.
I used to defend their calling the game "BG3", and was fairly aggressive when someone said they had a problem with the game being called BG3. My stance basically is that I would have no problem with the game being called BG3 as long as it is a
Baldur's Gate game in terms of spirit, mechanics, feels, quality, and so on, even though the story will be something else entirely.
So if the game turns out to be not quite a Baldur's Gate game, I will probably feel a bit embarrassed. The game may be as good as D:OS2, but if it is a D:OS3 rather than a BG3, then calling it BG3 is not cool.