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Well, I haven't looked at the poll numbers since last year (once), but I thought the argument remains as it has been for a long time: Tories may haemorrhage more votes overall, but less so in critical seats, and Labour risk losing just enough to take their winning edge off in those seats they have to target.
That may be out of date, and polling is not a science, but that's as I understand it.
I think I'm reading the Owen Jones piece (at the top of the page) as: voting labour is the tactic for the softest likely brexit. Remainers are dreamers. Look at scary Nigel.
It's not convincing. The polls suggest it's the Conservatives that haemorrhaged votes on launch of the Brexit Party.