Expected a github repo link but instead it's closed source and it costs $9 and it apparently doesn't even allow you to set the noise cancellation level. So it's $9 for an app that has two buttons that send bluetooth packets and it also reads the battery level in some clearly standard way because Android and iOS both show that natively. There's probably less than a screen worth of code.
edit: looking at the tweet[1] it's an electron app... An electron mac app for $9. Let that sink in.
[1] https://twitter.com/DannyAziz97/status/1389482681608679424
Who cares how it's built if it solves a problem for people?
However, this seems like a step backwards in an era where savvy companies are going out of their way to avoid any appearance of hiring bias. When companies are going so far as to strip names from resumes, asking candidates to perform on video doesn’t sound like a good idea.