If you go looking for the CymaScope on Instagram, the obvious handle disappoints. @cymascope, under the name John Stuart Reid, showed 87 followers and 14 posts. The instrument's real feed is @soundmadevisible: 514 followers, 265 posts, and a bio that says plainly "The wonderful world of sound is made visible with the CymaScope."
The CymaScope images a vibrating water membrane and photographs the result, which is a legitimate imaging technique. The framing around it needs more care. The project's own homepage lists application areas running from asteroseismology and haematology to quantum physics and sound therapy, without linking supporting publications from that page. Take the pictures at face value and the application list as marketing.
Also worth noting: both CymaScope accounts on X have zero posts, so Instagram is the only live channel.