My guess is scorched earth. BoJo is such a disaster that his own party had to remove him - and even that turned out to be a struggle (getting rid of leaders with challenged hair seems to have been a struggle lately on both sides of the pond). He became that unpopular.

The crew that have replaced him have no chance of winning the next General Election; Truss has even said that she knows she's unpopular, and doesn't care. So by running up the debts, they set a minefield for the next Labour government, which will have no alternative but more austerity. So I guess the Tories are planning to win an election in 7 years time.