The company has always said it's not bg3. There is no tav, it's four customizable characters with home brew rules and different subclasses.
That being said. I've been a participant in every twitch stream, and have poured hundreds of hours into solasta one. It's not bg3, I've played thousands of hours of bg3. It's like a nice compliment to it. Solasta twos Dev team is a team of fourty people. There's definitely not the same amount of money that went into bg3, but it is very very fun. The demo is great. It's a good comparison if you look at the tactical adventure only. The ttrpg part only.
Bg3 is very story heavy and solasta is more tactical focused.