I would assume they're recommending Edge now. We switched from IE to Edge around that time; and our company is very security conscious because of our clients.
I would assume you're wrong. I don't think you appreciate how many government websites run ancient software sold to them by a politician's cousin, who thinks even having a developer on staff is a waste of money.
They also run ancient shit that was promoted internally. Not to mention how many sites/tools are outsourced to vendors who then outsource development to foreign development vendors.
To clarify, this is concerning from a security standpoint and is not out of xenophobic bigotry.