They could alternately just create accounts, and continue to edit from work. Non-logged-in edits have IP addresses attached, but edits by logged-in users are pseudonymous; you wouldn't know if a user was editing from the Danish Parliament any more than you know whether I'm posting this HN comment right now from the Danish Parliament. The IPs are logged internally for a period of time, but those logs are available to only a small number of users (not even most administrators), who can only use them for a limited range of things: https://en.wikipedia.org/wiki/Wikipedia:Checkuser

Or maybe they'll just use Tor. And then they'll defend Tor in Congress because they have a use for it. I think I'd be fine with that outcome.

Wikipedia blocks Tor.

More accurately, most Tor exit nodes are either IP blocked from editing or the exit node servers block Wikipedia editing themselves to prevent their IP from incurring a block.

A common VPN would work just as well.

Bringing work home has not been a popular option in these spheres as far as I know, so the staff may become excluded. The officials themselves may be doing the edits if that's the case.

Even if that happens, there is still a lot of value in checking what kind of information manipulation happened historically.