As I said it's not exactly under-reported, that was your cue to search and find something like: https://fullfact.org/news/how-many-fit-work-assessments-are-...
And (to address your other comment) I assume you aren't being literal with your specific example (because the guy you were responding to didn't literally mean people were assessed on their ability to walk to a shop specifically), but yeah there have been reports of people who can't walk very far getting told they're fit for work (For instance this guy: https://www.cornwalllive.com/news/cornwall-news/photographer... from earlier this week)
Where's your evidence?
http://www.independent.co.uk/news/uk/politics/dwp-disabled-p...
https://www.theguardian.com/politics/2018/feb/12/disability-...
Happy now? Or are you perhaps going to try to play the no true Scotsman PR game and claim this doesn't count as real evidence?
If the guy had replied saying he actually did know the person I would have to accept that as true. He didn't.
Despite recent evidence, this isn't The Guardian and I am willing to believe that most people here are honest and don't just make stuff up to suit their political agenda.
To answer your question, two lefty news articles and fakenews.com don't count as evidence, no. His word would have been good enough for me.
Granted: Nobody’s linked to any papers or studies. But neither have you.