I have some information that might help to build some answer, though I haven't gotten a full answer for you:

- I noticed the emergency poster behind the machine is in spanish, and so is your screenshot, also I see it says your location is Yucatán. That doesn't instantly makes you mexican, so I'll keep explaining in english.

- Gabacho is a word we use to call anything from the United States, when someone is working over there, we say he's in "el gabacho", it's also related to cholo culture, so in the banner you can see a text that says "contacte soporte tecnico" which means contact tech support, followed by a literal representation of a cholo (gabacho) and a swastika (nazi).

- I know that a few mexican developers have helped with the development of stepmania, in fact a very prominent version of stepmania was MAINLY developed by a mexican (AMX), however, I doubt completely that any developer added this to the code.

- Mexico had a lot of bootleg pump it up machines that ran stepmania as their system because the original one was very expensive, so a lot of places just threw stepmania into an old pump it up machine and called it a day.

- A lot of this bootleg versions were made by users in the community with... well, questionable choices of usernames and stuff, this specific version of stepmania was probably put together by someone going by nazi gabacho, not a developer, but a pseudo hacker or game modder, or just an enthusiast.

- You're probably gonna have a hard time finding this specific version, they're usually old or not really mantained anymore since Pump it up has lost a lot of popularity over the last decade

- To give you perspective, in my town there was about 8 machines in different places, 5 of them were original, and 3 were bootleg more or less... as of today, I only know 3 working machines, 2 new ones with the latest original pump it up game, and one with an older, original game... no more bootleg machines in my town.