I can agree with a few points, but overall that was a very shallow and amateurish analysis.
I agree with the obvious; the PL winner often concede few goals (even though last time United won the PL, Rio, Vidic, et al conceded more than Maguire /Lindelof). I also agree that Lindelof would be better suited at Liverpool.
What I disagree with is the common opinion that because Maguire is slow, and Lindelof is not fast, they are poor together as partners. Theoretically I guess it makes some sense, but if this was true in reality, they would concede a lot of goals in open play. But they don’t. It’s actually the opposite. They conceded least goals in open play of all teams in the PL last season. This season the pair has conceded 19 goals of which around 8 goals were in open play in 17 PL matches. Roughly one every second game. Hardly any of those were because Maguire was slow and Lindelof was too slow to cover for him.
Also this idea that if Maguire’s partner is super fast we can play a very high line, it is naive. Neville wants a fast partner that should cover behind Maguire AND also press up high. It doesn’t work like that. We saw how super speedy Upamecano couldn’t keep up with Salah and Mane yesterday. And that was when he was covering only behind himself, imagine him covering for others. You can to some extent use a speedy defender to cover for a slow, but not if that CB also is going to push high up.
If we want to improve defence, number one is to sort out the organisation at corners and other set pieces. A speedy CB would not add anything there.