No sarcasm. Yes, it looks like an ambulance (seemingly deliberately). The tweet/fart/whatevertheyrecalled just has strange choice of phrasing implying they will follow up on this, then they don't. _Why_ is it an ambulance? Well who cares, I guess - but the author of the poof/squirt/whatevertheyrecalled is the one who draws attention to it in the first place.
It's a several decade old piece of hardware that was likely produced in extremely limited quantity, so finding the answer to that is probably not going to be easy. Presumably it was produced as a promotional item made to promote their GPS receivers for some kind of safety application that the ambulance shape is a reference to, but good luck confirming that in 2023.
Whoever designed the board may have just done it as a joke, but I think giving the coastguard etc. an idea of your general location when in distress would have been a good civilian use of GPS in 1993
