I agree with some of that, but a load of it steams.
Johnson was a buffoon of course, and one lacking in principles. However, I do believe that when he was elected on his mission to Get Brexit Done, and to re-energize the north, build new hospitals etc, he was genuine in his aspirations. I was greatly encouraged at the time because I felt that having gained many red wall seats, the Tories (who as I say I am not a fan or per se, but who at the time came closest to my political beliefs) would rule for another decade or so at least. Labour was potentially finished for the foreseeable. Great news.
To his credit, Boris did get Brexit done. Not in a way that pleased everyone, but getting it over the line at all was an achievement bearing in mind how divided the Commons had been previously. And he negotiated a deal better than many thought possible. You can't please everybody of course, inevitably on such a divisive subject itself.
What followed was a shambles, absolutely and I would say completely brought about by COVID. Not only did it scupper all his aspirational investment plans, more than that it sucked the air completely out of the political room. It was all encompassing. Nothing could be done politically, fiscally or in the country as a whole. And of course it led directly to Boris' downfall due to his buffoonery and stupid lack of judgement over the Christmas parties. (With an opposition pouncing on it, and milking it for all its worth, I might add).
That was really the end. The rest they just stumbled through until kicked out.