Its the only strategy, for Labour, i.e. to turn the Tory leadership election into a liability, to get ahead in the run up to the next election, get Labour's mantra into the heads of the non-politicized public.
Otherwise, its sit back and let the new Tory leader dole out money left and right, (as they will have to do) thereby stealing all Labour's clothes and nullifying the TU's.
FGS if Starmer cannot see whats happening in front of his eyes, then Labour right, left or extreme left are finished (for whats left of my lifetime) anyway