If we Picked one of Bernard or Kean it would be a 4153 because Sigurdsson is a striker (anonymous one, but still a striker. And if you think Schneiderlin is bad at CM with his 16 backwards passes, just wait til you've seen Sigurdsson who wouldn't even be able to touch the ball 16 times.
The paragraph where he talks about 442, makes that tweet an awful tweet. A nuffie, cringe tweet. We already play 442. Schneiderlin might be a problem, but the second striker SIGURDSSON is twice the bloody problem.