Public borrowing, or the deficit, goes up and down constantly, its better to grow the economy to reduce it than slash services, something Osbourne completely failed to do.
As a policy, Austerity was/is a fucking disaster, its going to cost the UK far far more to fix all that is broken in the UK, be that roads, rail, utilities, schools and hospitals or as i suspect, it wont get fixed and UK will continue to sink further down the rankings as inequality grows.
Debt to GDP therefore steadily from 2010 to 2020, be fore sky rocketting during Covid.
Not quite sure why you re defending the tories in a rather round a bout way?