Prorogation of parliament does indeed happen regularly. No one disputes that.
However, there has been no change of government - there's been a change of PM which isn't the same thing. Prorogation also usually only lasts for a few days, not a few weeks. This is not 'business as usual and it is gaslighting of epic proportions for Johnson, Rees-Mogg and all the rest of them to try to suggest that it is.
It is a profoundly undemocratic attempt to use our unwritten constitution - which basically relies on the PM being a decent, moral human being with the best interests of the country at heart, not a fucking sociopath - to drive through a destructive policy which is wanted only by a tiny minority of the population. If it were happening in any other country we would have no trouble calling it a coup.
If you think any of this is 'literally what usually happens', then you're not paying attention.