I mean something also to note is that just because one uni has high entry criteria doesn't mean all do. There are law degrees which accept students with CCC at A-level, and there are law degrees requiring A*AA. The entry criteria really don't say anything about the degree subject - and also since published entry criteria can and will be inflated by some unis who know students use them as a reference point for "academic quality" (erroneously), they're not even good for gauging the "quality" of the course, or even the selectivity. There are some unis which have many of their courses with entry criteria of all As and A*s but when you look at the data of who they actually accept, the entering cohort's converted tariff scores are considerably lower than if they were all (or even mostly) at the level of their published criteria.
It's really just beyond pointless to spend any time speculating on the interpretation of entry criteria beyond just accepting they are a loose guide for the rough level one should be predicted to apply to that course competitively.