Yeah, the modus operandi of this administration is "say whatever, say it loudly, say it a lot".
A lot of folks in the US won't have a clue that the Navy only has two hospital ships or that they're both undergoing maintenance in drydock at Alabama Shipyard in Mobile, Alabama. USNS Mercy is based in San Diego, meaning it wouldn't be sent in the first place as it is responsible for Indo-Pacific operations. USNS Comfort is based in Virginia and would be the actual ship to be sent. The Comfort is doubly complicated because it only arrived at Alabama Shipyard last month. For reference, the Mercy docked for maintenance at Alabama Shipyard at the beginning of summer last year. So it could be another 6 months before the Comfort can even leave drydock, at which point it would then need to sail all the way around the Florida Keys, get up to Virginia to dock at home, resupply (and possibly incur some wet maintenance, which would take even more time), and then set off for Greenland. So we're talking 9-12 months at absolute minimum, IMO.