IIRC, this has been the case for a while. I seem to recall getting a Raspberry Pi ~5 years ago which had Mathematica on it. Admittedly it was quite slow, but as far as I can recall it did work.
The Raspberry Pi is how I got introduced to Mathematica in 2019. I actually it for Advent of Code that year, which was difficult and frustrating but a huge learning experience!
Yes, it's been around for ages. I actually used a Pi when learning linear algebra to generate problem sets.