6. Nb3 in the Najdorf

About a month ago I wrote some comments on a loss by Vincent Keymer in this fashionable line. Yesterday Marie Sebag tried to improve, but went down fast. Sorry, but this concept looks wrong to me. Black cannot transpose to setups from the English Attack.

If white doesn’t have waste time with a3, the attack is very fast and way too dangerous. Note: They do play a3 on the highest level.