Well if they did, and I sincerely hope they did, then what a wonderful, poignant, historic, unforgettable and utterly appropriate epitaph to the mighty Vulcan's career, bowing her out the same way Roly Falke bowed her in at Farnborough over half a century before. That, if it did actually happen, has an simply magical symmetry to it that will live in the annals of aviation for ever. How could any pilot with a soul miss such an opportunity?
If I had been flying her I'd have done it for certain and pleaded "guilty, Your Honour and with pride", and taken the penalty cheerfully.
Wouldn't you?
The worst they've done is exceed a flight manual limitation re aerobatics. The aeroplane is demonstrably able to do it and take it so reckless endangerment is a bit of a stretch, and as said above it wasn't at an airshow.
If they did, Bravo Zulu, and if not; reasons in writing please.