Ake is better than Lindelof & Bailly. I'm not sure how people get the idea Lindelof or even Bailly are better. I have seen what he is capable of on the ball, I can say he's much better than Lindelof in term of ball playing.
Defensively, he's still better than Lindelof (just look at stats below).
Lindelof lost in the air against Schlupp (178cm) who is 2 cm shorter than Ake. The issue about Lindelof isn't only he's weak but he also can't even aim the ball properly with his head, I wouldn't say the same thing on Ake. Ake has scored 11 league goals with Bournemouth in 4 seasons, I'm sure most of the goals or may be all of them came from heading. That's still pretty good for a centre back.
Apparently his team mate Ramsdale thinks he has the potential to play for top club as he's actually much much better player than what lot of people think he is right now (1:30).
I personally think he's an upgrade of Lindelof. Whether he can take us into the next level to play next to Maguire is something I have doubt since I've seen him making easy mistakes. However, His transfer value is around 25m-35m thanks to his club's performance this season which is much cheaper than nowdays centre back. If we decide to go for him, I can understand the reason of it because there is a value of worth a punt, he has good potential and he is proven PL experienced centre back.