Earlier quoted context omitted.
DNS records of your VPN or corporate work station would be pretty easy. You can line then up with when the review was posted. Then investigate their workstation more "thoroughly".
That's why you shouldn't use your work computer for anything but work!
I never understood people who use their work/school machines to do stuff that could hurt their employer/school. Or even just to cause them potential problems.
But of course, the other way around is true imo: I won't use my personal devices for work - but that's mostly to prevent me from giving free extra work time to my employer.