”The 'far right' have no control over who leads the Labour Party”

Except insofar as, in the case of Corbyn, it was the Right’s bare-faced lies, trumpeted ad nauseam by their Right-Wing press propaganda-machine, about him - ‘Friend of Terrorists’, ‘Hates this country’, ‘Communist’, ‘Anti-Semite’, yadda yadda - which, at least in part, brought about the mass desertion by ‘Red Wall’ Labour voters at the 2019 GE, which caused the worst defeat for Labour in living memory, which in turn resulted in Corbyn’s demise as leader of the Party.

Not the only cause, but certainly not an insignificant element in events leading to Corbyn’s departure.