Haven't read the piece yet, but I think this issue has a definite relationship to the hype within the show that we always complain about on the Strictly threads on here – mark inflation, constantly going on about 'when will we see the first 10', 'the standard is higher than ever', and of course having people on like Layton and previous years' pro or almost-pro dancers.
I can well imagine that, if you're a pro and you have someone who's not an out-and-out duffer (in which case you'll court the comedy/sympathy votes instead), you'll feel under immense pressure to get them to be good enough.
To be clear, I'm NOT trying to excuse any individuals' behaviour; and I'm very aware that it's all male pros who've been named, and very few of them at that, and none of the women. But I do think the vibe of Strictly has become less and less about 'having a go' and getting points for trying, and more and more about setting high standards for itself/its contestants and trying to raise them year on year, to the detriment of viewer enjoyment (IMO) and of course to the detriment of those celebs who end up on the wrong end of their pros' ambitions and/or 'old-fashioned' teaching styles.
I think the production team needs to take a long hard look at the show and how they present and hype it.