Hard not to see Truss's coming to power as a kind of coup. Less noisy and showy than the completely botched attempt in the US, but essentially a coup. Exploiting the vulnerabilities in the system to bypass democracy.
This budget makes it clear that she's a dim-witted puppet of those who maneuvered her into office. We are in the midst of a crisis where the less-well-off are facing complete immiseration and her response is massive tax cuts for the rich (in turn causing an immediate slump in the value of the pound and thus making the cost-of-living crisis for ordinary people even worse).
Borrowing a fortune to pay for tax cuts for the wealthy (and a subsidy for private energy companies already making massive profits) at a time when the country's credit position is already looking precarious is the nation-level equivalent of hijackers crashing a plane into a building.
Unlike Trump she didn't have to play the race or populist resentment cards to win power, because she didn't have to worry about the electorate at all.
She indirectly benefited from Johnson doing that, with Brexit and the rest, but in the UK, as opposed to the US under Trump, it's been a two-step process, because Johnson himself didn't have much interest in taking Thatcher's class-warfare to the next level. Plus, Truss seems much more malleable and less-inclined to go wildly off-message (indeed, off-planet) than was Trump. She lacks the entertaining panopoly of psychological dysfunction of a Trump. She's the Stepford PM. She may actually be a robot.