It is striking how limp and unjournalistic that Observer article is. Basically, it just seems to allow the WEP to report its own narrative of why the group failed. That narrative focuses entirely on the environment in which it operates (rather than on any problems with the WEP) and includes some bizarre uninterrogated claims like the one about the "normalisation of far-right narratives". Perhaps that does mean something (potentially -- not sure what that meaning would be), but without any explanation it just sounds like social media footstamping, rather than analysis.
There is a suggestion throughout the article that the political landscape has changed so much in ten years that a brilliant, innovative and thriving party was wrong-footed out of existence. That just doesn't make any sense at all.
I think the article is suggestive of how corroded people's cognitive capacities become when they are required not to see what they can plainly see.