Surely the 'breaking into' Parliament and super-glueing themselves to and around the Speaker's Chair shows XR folk are State actors or, at least, State approved actors. Armed police are the norm around Parliament - there is no way (that's 'no way' as in NO WAY) these folk would have just walked in. Their getting into the Chamber would have required a lot of inside co-ordination - why would this have been permitted unless their 'message' was approved of by the very forces they (XR) claim to be protesting?
You only have to compare the kid gloves treatment XR protests get from the police with, say, that meted out to anti-lockdown protestors to realise how Establishment-friendly they really are. Useful idiots at best; bought and paid for at worst.