Yes, although had he and his team not been so flagrantly amateurish about dealing with it (as they were amateur about so many other things), it wouldn't have been so bad. I mean, in the USA, AOC is super-progressive, but comes across as laser-sharp politically as well. Corbyn and team team had the air of people striving to win a student union presidency, not national leadership.
Corbyn will end up burning the Labour Party for years. Millions of voters have lost faith in Labour, because they don't trust a party that could install someone so manifestly unfit. He's still got a big chunk of middle class progressives singing his praises and fighting the good fight, but he's shattered the party in what should be its working class heartlands.
And this is the mess Starmer has had to pick up, a party with no credibility: considered weak, unpatriotic, impractical, extreme. I suspect Starmer is a cautious leader anyway, but even if he did harbour ambitions of adventurousness, the parlous reputation of the party demands the steadiest of hands on the tiller.