The first part is right on the nail. Provides the detail that totally debunks the XR NVDA proponents reliance on lessons from history. Very good.

The second part is also useful, covering some examples of possible actions and their pros and cons with examples and how the radical flank has to walk a difficult tightrope between undermining the main thrust of the movement by provoking an extreme reaction, and being ineffective in convincing the fossil powers that they need to make changes to accommodate the demands for change.

The third part is really unsatisfactory as it is a digression to tilt at some windmills that really do not deserve attention. 

What is lacking is any discussion of the forms that effective action might take or the nuts and bolts of organising - perhaps this is for another writer to pick up.