The government was obsessed with grade inflation, but there is no way of telling which grades have been inflated and the big centres have been made to do the "heavy lifting", by having their grades adjusted, so that averages appear acceptable.
The kind of algorithm which was developed was never going to be fair to many individuals, but details have never bothered Johnson.
I think the only solution now is to do what Scotland did and accept teacher assessments and lift the 5% cap on university place. It might mean that a few students won't cope with their first year (unlikely) or a few are given jobs which needed minimum grades, but that's better than this blatant unfairness.
Johnson will, of course, hate to follow Sturgeon's example, especially as Conservatives were trying to score political points over Scotland's actions.