Seriously, I think it’s more to do with things Mourinho has said several times in the past: we are too slow in the early attacking phases, and that he want’s the risks taken in the furthest part of the pitch, not in the middle or our own half.
This means he wants midfield players to not spend time with the ball, looking for brilliant options, risking loosing the ball while slowing play. He wants simple balls played quick and early, with the right players starting early runs to join the attackers. Carrick in his prime could most times play through the lines early with little risk. Pogba can do this only seldom, and this is why Mourinho was dissatisfied with him roaming, looking for a decisive pass, and satisfied with his world cup, wher he eight out of ten times would pass quick, simple passes, and only strike the hollywood ones when he saw them immediately, IMO.
If he want’s Pereira to learn how to play his way before the better midfielders arrive, he’ll want him to use these matches not to show what brilliant stuff he can do with the ball, but to show that he understands how Mourinho wants him to play against Leicester and Liverpool. And in that regard, I guess it makes sense to say he’s happy with his work and intentions, while his solutions so far is not yet more than ‘okay’.