If it is custom, dude should call up Guiness to make it an official record.
As for the currently available ones, that limit isn’t software, they even advertise a higher “freespin speed”. You can use this article as reference, but I found similar from other manufacturers advertising high speed electric unicycles.
Could be something custom. Also, it is often possible to disable manufacturer speed limiting devices.
If it is custom, dude should call up Guiness to make it an official record.
As for the currently available ones, that limit isn’t software, they even advertise a higher “freespin speed”. You can use this article as reference, but I found similar from other manufacturers advertising high speed electric unicycles.
https://inmotionworld.com/blogs/blog/euc-top-speed-freespin-vs-safe-limit