Yes, I guess the claims did come from the employees. I'm inclined to believe them, as I had similar experiences.
We were also told that remote working was a great success and productivity had actually risen over a couple of years. Now of course they want us back in the office a few days a month because reasons. Since our whole job involves talking with people spread across the US, the UK, India and external partners (not with other members of our team), I'm not convinced there is any boost to commuting into a noisy office filled with people on WebEx calls...
It's an unsourced claim from the employees. And I agree on the "decent" productivity piece.