I was expecting a blog post or something better like a Youtube video explaining the instrument and demonstrating what's unique about it and how it works, but instead got a direct link to the purchase page. Is this just blatant low effort advertising?

If you care about wind controllers, you might "easily" be able to make one for yourself with a pressure sensor (one with HX710B chip looks good), standard 4 to 2.5mm pneumatic tubing, Y-piece, melodica tube and a mouthpiece, and RP2040 that converts the pressure sensor input into USB MIDI in. Costs a couple of bucks.