Absolutely this. It's something I have mentioned a couple of times.
I'm not sure that they gave them even one bit of feedback. They basically treated Tony and Katya as a joke. It was obvious that Tony worked his socks off to improve. Yet it was only on the night that it was announced that they were withdrawing, Craig (if I remember correctly) said to Tony 'people like you are what the show is about'. And Tony replied along the lines of, 'it's a pity you didn't say that to me somewhere along the way.'
The judges need to be schooled also re their approach, in this new world. Shirley, quit with the favouritism and the cutting remarks. Motsi and Anton, give proper feedback. Motsi did better on this last time around than previously. Anton, use your words, you can and should be able to empathise (without repetitive anecdotes) and give feedback, Craig is reasonably balanced most of the time, but can be a bit cutting too, and he also needs to remember that these are not professional dancers.
As an aside, Tony and Katya have remained friends, I'm sure I have seen photos of them together on their respective social media, since Strictly. So presumably that means that even though she worked him hard, that was the height of it. I would hate to hear anything bad about Katya! She and Nigel have also met up since their stint together.