I don't the he means every position, but rather defence, midfield and attack.
I don't like him as a manager, think he could have performed better. In truth he has clearly not meshed with the squad.
However, he is absolutely right in this regard. 3 year rebuilds are nonsense. Teams can change in quality over night. Serie A in the 90s and 2000s were a clear reflection of how simply adding a few players or losing a few players could change the entire narrative surrounding a club. Inter was always behind because they always made rubbish decisions. Whilst Milan could go from being non competitors to winning the Champions League just by getting Pirlo and Seedorf in the exchange with Inter.
A club like ours shouldn't have such scarcities in midfield, attack and at full back. This doesn't mean we should spend on 10 players this window, but it does mean that we need to ensure that the majority of players currently in the squad are no longer here in 2 years. It also means that these players need to be replaced with players that have shown enough quality to demand the attention of Man Utd. These players don't have to be expensive and should not take up a huge part our transfer budget like Pogba and Maguire did. We can't afford to sign players that have limited first team exposure when we sign them like Martial or Amad. We need consistent quality.
In my opinion, below is a list of players that actually have the quality to play in any capacity at United currently. This does not mean they should start, but they are at least the quality a United player should have:
De Gea, Maguire, Shaw, Pogba, Ronaldo, sancho, Fred, Bruno, Varane, Wan Bissaka, Cristiano Ronaldo and Rashford.
De Gea Varane Shaw Bruno Pogba Sancho and Ronaldo are the only players who have the quality to start for United in terms of talent.
Neither Pogba or Ronaldo are going to be here next season. Rashford has a lot to prove as well as I'm only including him based on hope that he will return to a form of what he was 2 years ago. Even then, I have never felt he had the quality to consistently start for United. At best, being in the mould of Kalou, Duff and Cole, where he rotates with other wingers .
The irony with our squad is that the individuals I picked as having the quality to start in our team are also the only players of age ( Matic and Mata are semi-retired) who were actually bought based on their consistent performances at other clubs. Out of the 30+ players we have in our squad, only 7 of them were brought into the squad using the criteria we should always use to sign players....showing consistent quality in performance. That says a lot. Most good teams have at least 14 or 15. What's outstanding is that if reviewed, it can be claimed that outside of Di Maria and Pogba, most of our flops should have been expected.