Back then, the Moth was "old", now they're virtually flying pieces of history - do we need to loop them at this stage in their vintage?
Why not? They're designed to do them.
If they are maintained and monitored to appropriate standards and the pilots who aerobat them are trained to a suitable level, there is no reason why they should not.
By way of example, there was a recent Emergency Airworthiness Directive issued regarding wing tie rods which prohibited aerobatics until the necessary inspections were carried out. Following satisfactory inspections, aerobatics could be resumed.
A sensible and logical approach and the Moths are far from the only aircraft to have been subject to Emergency ADs over the years - some of them being much more modern types. I regularly fly another type which was subject of a modification requirement and reduced G limitations as a result of an airworthiness directive. If the Moths needed more restrictive permanent limitations, I have absolutely no doubt the authorities would have insisted upon them.