I believe it is, yes.I haven’t rewatched it (and don’t want to). Thought the first half was open, but their attacking quality was awful, a better team would have made more of some of their positions. Reguilon drifted infield a lot, leaving his wing exposed (was this planned by Mourinho?)
He likes Serge to push forward, which means the other 3 defenders shuffle across , making it like a back 3.