Trying to learn from the coach bot on chess.com

I'm trying to improve by playing the coach bot, however I'm not sure it is helping me.  Take the following position:

From the evaluation bar I could see I was ahead, but I couldn't really see why so I asked the coach bot for a hint for the next move - this is what it suggested:

So I played the suggested move, Bxd5, and received the following assessment:

So the 'hint' fed me an inaccuracy!  I'm now not sure how useful the coach bot is when trying to improve my game.

Oh - and does anyone know why the evaluation bar number (+4) does not ties in with the numbers next to the moves (+2)?

Anyone?

why not levy tho

I DONT LIKE THE MISLEADING COACHING. IT HASNT HELPED ME AT ALL. JUST BE A REAL COACH AND HELP.

for real

Never play bots, never listen to bot coaches. AI means Artificial Idiotic. Play against people, analyse your games, solve puzzles, study games of old masters. If you don’t understand something, make a thread on forums. Try to find local chess club near your home. Analysing your games together with your friends is priceless.

The evaluation bar is calculated from the best move and the inaccuracy was rated less