Because he is, and anyone who thinks Pep Guardiola is going to hand pick a LB for this side and end up with a player without technical skill is an idiot.
The same kind of idiot who thinks Sterling has no technique and Rodri's too slow to play in the Premier League and Gundogan's too soft, and Cancelo's got nothing about him etc.
You don't get signed by Pep without having a very high level of technical ability. Some player might look weak compared to some of our players who are among the most technically gifted players in world football, but none of them are short of good.
The same applies for intelligence and work off the ball. Guardiola and Bielsa don't fall in love with stupid footballers.