Sure. But whether you spin it as "return to work" [as if you weren't doing something/somewhere that could be considered "work" before] or "return to office" is likely to be revealing as to your mindset about the whole thing.
Language has connotations that influence how we interpret others' arguments.
That's wild. I must have said "I am going back to the office" organically hundreds of times.
For example, if I went to lunch with a colleague and had to get back to the office for a meeting or to get back to my computer. Or if I was at an off-site meeting that just ended and I was going to trek back to the office.
I don't say it much anymore, as WFH has cut all this needless commuting from my life, but I use to say that constantly.
But here, where people are already working from home, saying these already-working people are violating the "return-to-work" order is just fundamentally disrespectful of the work people were already doing.
It makes sense why those workers would seek to form a union; it sounds like management is really belittling their work, even through the language they feed to the press.
Which is based from "work" predominantly being done in offices and factories and such.
In the era of increasing "working from home" and working remotely from cafes and elsewhere, mixing the two is an anachronism that should stop. It also diminishes WFH.