Some people seem to have defined "the left of the party" as entirely centred on Corbyn.
Team Corbyn = The Left, Not Team Corbyn = Centrist Blairite Shills.
It's all relative I suppose, Starmer is of the left, in the party I would describe him as centre left, in the country generally he is left.
Some might call Corbyn hard left but I don't think that label applies to people who believe in democratic principles etc.