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Not so quite. Somehow I dont like the knight f5 It can be kicked out with a tempo: g6, Ne3 or Ng3 and after that black can fianchetto: Bg7 and is ready to castle 0-0. But what I found out with Houdini: It suggests Ne3 followed Nc4 attacking the queen. Interesting and quite double edged line I have to say!

I have to try it out and study it a bit deeper than this glance

Edit: And I know computers aren't that good on studying openings haha!

Why should White want to play 6. Bb5+ and exchange his light squared bishop? Aren't both 6. Nb5 and 6. Nb3 well known, and good, theoretical moves?

There is no concrete refutation of that line. White just has a large positional advantage that he will maintain without much difficulty right into the endgame. The position in the diagram is unpleasant for black because he has nothing in return for his bad bishop, hole on d5, and backwards d-pawn.