Dave:
I thought I'd give it a go. She doesn't make it difficult to disagree with her.
First paragraph (from your link):
Amid slippages, losses, vanishing investments and export drops, the drip, drip of Brexit damage never stops. I collect examples every week, as if picking up spent mortar rounds from a battlefield. On Wednesday, it was 450 jobs lost as car parts manufacturer Toyoda Gosei prepares to shut factories in Rotherham and Swansea, and relocate to the Czech Republic.
The link she gave in that paragraph, supposedly to support her argument was to the BBC. Unfortunately the BBC article says: The company, which produces components for Toyota, Nissan, Renault and Honda, said it was responding to changes in the global sector and a "significant reduction" in UK customer demand. AND "There isn't one factor that has resulted in the announcement today," added a spokeswoman.
Nowhere in the BBC article do they blame Brexit. (although they do link to yet a further BBC article about generalised problems with the supply chain) So if Polly Toynbee is putting links in her articles maybe she thinks no-one will read the links, but just assume that she's giving supporting evidence.

Then, after using a headline saying: Forget curtains and cash – Johnson’s legacy will be the bitter taste of Brexit in the second paragraph she goes on to discuss the wallpaper for Downing Street. Consistancy of message? No!