Shaw implies the front end did not provide enough options of passing the balls and intensity of pressing the opponents. Also interestingly, he thinks someone is not giving 100% .
If you really watched the game, I think he means Ronaldo. Could not hold the ball well , did not press well , did not fight for the 2nd ball or sprint for the 1st ball.
Honestly, Ronaldo should be the 1st one to sub off in this match. Greenwood actually was the best performer among the front 4 and no idea why he was subbed off first.