You are completely right that these are misleading headlines. The news is based on a new measure in the A-level league tables of numbers gaining AAB in 'three facilitating subjects' (maths, sciences, languages, Eng lit, history or geography) rather than numbers getting offers or places at Russell Group universities.
Meanwhile, Russell Group advice for students considering many courses (obviously not e.g. medicine, dentistry, etc.) is to take at least TWO of these subjects out of their three A-levels, but not necessarily all three:
www.russellgroup.ac.uk/media/informed-choices/InformedChoices-latest.pdf
In fact, it also advises on A-level subjects not on that 'facilitating' list that are useful for certain courses, e.g. economics (for accountancy or business studies), politics (for language degrees), design technology (for architecture and some engineering courses), religious studies (for art history or philosophy), etc. But students aiming for those subjects with perfectly acceptable choices would be counted as failures in the league tables if media reports are to be believed!
The head of Tiffin School has expressed her horror over this misinterpretation of Russell Group advice and devaluing of subjects like music, art, etc. - where are our teachers going to come from?