

It could be either way.
In a for profit setting when those who do the work are the very same people/institutions who measure the quality of that work (in this case schools which both teach something and then measure how well that something was taught), it’s not at all uncommon that the measuring methodology gets changed over time to yield better results for the same work rather than the work changing to improve the results in the existing measurement methodology.
This is why independent measuring of results is a thing.
In this case to know for sure we would have to get the opinions of existing medical practicioners who have worked side by side with recent graduates from these and other schools - if they tend to see graduates from these schools as coming in worse prepared than those from other schools, then this outcome we saw is probably due to the kind of situation I described above.



The Guardian is very openly pro-Lib Dem, actively participated in the slander campaign against Corbyn including the one where a Jewish Holocaust Survivor was deemed an anti-semite to try and taint Corbyn by association and its columnists very openly say of themselves as being “Opinion Makers”.
These people are the very opposite of a trustworthy and unbiased news source when it comes to left-wing politics in Britain, with the notable exception of Monbiot and Owen Jones.
Sourcing your “information” about internals of left-wing parties from traditionally propagandist hard-neoliberal news media is almost as bad as sourcing it from fascist tabloids.