No they weren't.
Corbyn became unelectable because of the years-long fake antisemitism smear campaign.
Boris wasn't just "not that much better", he was and is a worse human being on any and every measure, innately dishonest, totally devoid of any political principles, in it for himself and only himself.
As I said, the members face and may still face a tough decision - replace Coirbyn for the sake of political expediency, or support him as a matter of principle, decency and honesty.
There is simply no comparison between Corbyn/British labor party, and Shorten/ALP.
They are in completely different political universes.
Australia's centre-right ALP is just Tweedledee to the LNP's Tweedledum, and has been ever since Hawke et al hijacked the party and disfranchised the left in Australian politics 40 years ago with the help of his mates in the DLP unions and the crooks at NSW Labor HQ.
British labor under Corbyn, supported by the majority of its membership, became once again a genuine centre-left party after the deplorable Blair takeover; which, of course, explains why the billionaires' press so eagerly jumped on the fake antisemitism campaign as soon as the Israelis started it - much easier than saying "We don't like him because he threatens our political and economic control".
Labor's biggest problem was the irreconcilable split over Brexit, between its pro-Remain membership, and its pro-Leave working class constituency. This issue is now effectively settled, and the party's problem now is to regain its industrial-area voters.
Anyway, the investment in the smear campaign has worked, congratulations to its instigators, perpetrators, useful idiots and fellow travellers, you should all be proud of yourselves. You're welcome to the world of BoZo and his gang of Neanderthals and morons.
Have a read of this thread. Nails Corbyn completely.