“Well that part is completely wrong.” Perhaps. It is how a 17th Century French lawyer analysed it.
This text is part of a study why the French Assembly could put Louis the XVI on trial according to the law.
The problem was by the first Constitution, the King was exempt of all prosecutions.
So, Mailhe goes in a same kind of context to see why the French can do it, and what has to be avoided.
In his view, the fact that the British Parliament wasn’t elected by the English people, that there is no British Constitution was the flaw and the reasons why they went back to the Monarchy.
He thinks that Cromwell ambition was one of the reason as well for not having a Constitution fixing the frame of Powers.

Well, it is how I analyse his text.

He is in fact afraid of what will happen: Napoleon