These didn't look nice on Reverb a few years ago, but the product line seems to have grown.
Still don't get the single neck double sided thing...https://busuyiguitar.com/en/
The rotating neck is......interesting; sort of a great answer to a question nobody was asking. The ones you link to, with two separate necks on opposite sides of the body? Likewise.
The ones with fretboards on both sides of one neck? Well, I guess if you have no intention of playing in more than one position, it would only be
mildly stupid - but even
I - The World's Worst Guitarist, The King Of The Cowboy Chords - move up to the 7th fret sometimes.
Peter