The article doesn't say that people were hired and promised 100% remote work. More likely, they have an office with their name on it already and they just have the ability to work from home whenever they want and so they never come in.

I don't see this as a bait-and-switch unless there's something to back that up.

When I worked there, I took the job because of the flexible work-from-home-when-you want policy, which I hadn't encountered for.

I'd certainly be feeling baited-and-switched right now if I hadn't already left.