I can’t tell you anything about that specific course but I can tell you about Manchester offers last year (my dc was accepted by them - not starting till next year as applied deferred).
Anecdotally they would have appeared to have made less offers (as did most places) after cancellation of A Levels. All tge offers I know of (quite a lot on a broad range of courses) were tge standard published offers (I don’t know any students who were eligible for contextual).
I know a couple of students who missed their offers by a grade (Manchester was their firm choice) and were rejected- everyone accepted met (or in most cases exceeded) their offer. Manchester had nothing in clearing (neither home or international).
Who’s to say what next year will be like but whilst a Uni may well make the standard offer to a student predicted lower I would assume they would reject the student if they don’t get the grades.
This year very much split into Uni’s with places in clearing and those who didn’t. Off the top of my head the following didn’t have anything in clearing:
Manchester, Bristol, Exeter, Bath, UCL, LSE, Imperial, Birmingham, Leeds and I’m sure many others.
Students picked things up in clearing from Notts, QMUL, Cardiff, Reading, Manchester Met, NTU, Liverpool amongst others (Notts in particular had a lot in clearing).
Good luck to your ds - Manchester is a great Uni and great city.