Hmm, not so sure. He produced a digital signal, who’s spectrogram happened to be an image, and then played that digital signal to a bird. Dunno if a analogue spectrogram really even makes sense as a concept. The only analogue part of the chain would be the birds vocalisations, right?

Reverse proxy with mTLS in front might be a simple solution depending on your setup

https://www.youtube.com/watch?v=YhuWay9XJyw