A great achievement by St Andrews, but given offers from both Oxford/Cambridge and St Andrews how many would choose St Andrews? I can't imagine it will be many, other than perhaps a few Scottish residence who chose it to avoid the uni fees?
Admittedly, Oxbridge it put on a pedestal because of the early deadline and the fact that you can't apply to both. This separates them from the rest and makes them them very special in people's mind, especially with all the history and nobel prize winners etc.
So maybe the league table is correct. Maybe St Andrew's is just as good or even better than Oxbridge, but in terms of people perception and desire to go there, Oxbridge is very much in a league of it's own, and will stay that way for the foreseeable.