The Liz Truss saga is a strange one. Has she genuinely moved to the far right? Is she trying, cynically or cleverly or both, repositioning herself there for a political comeback? Or is there something else going on?
Cognitive dissonance is a powerful force. When we have two beliefs that we are aware strongly conflict we have to resolve it. You can do that rationally, but there are strong mechanisms to do it in other ways.
Liz Truss believes, as most of us do about ourselves, that she is a decent, competent, smart, sensible person with good ideas. 1½ years ago she was humiliated to be told that she was a foolish, incompetent, naive person with bad ideas. This is a strong conflict.
So I think it's possible that she has grasped the populist idea that she was brought down by 'the blob' our 'the deep state' as a way of resolving this dissonance. For clarity, this means not that she's decided to adopt that idea to save face: she genuinely believes it.
(I also think this about Trump. I don't believe for a second that Rudy Giuliani, Sidney Powell or John Eastman believe the 2020 election was stolen, but Trump will have found the rejection more personal and maybe cognitive dissonance led him really to believe his Big Lie.)
Virtually no one thinks Liz Truss did a good job as PM, so the gap between her view of the world and everyone else's is very extreme, which - to preserve her fiction - only goes to prove how pervasive the blob is. Hence the grand/absurd claims in her book about western culture.
@DanRebellato Michael Wolff's book 'Landslide' is really good on this. Trump absolutely, and very quickly, is able to convince himself of anything.