Yes! And it’s hard not to hear the tracks where Sean sings as essentially Les channeling (late) Beatles. Between Sean’s voice and Les’s bass, The Claypool Lennon Delirium are like a beautiful time travel accident in a recording studio.
Connection to Bandicam: look center top of the video, and in the video description on youtube.com itself. As I type this, both the video and the description contain a URL linking to it.
Sure, but all that proves is that he used it to create the video. It’s not actually proof (or, in my mind, even evidence) that he was trying to sell Bandicam. I’d bet four bits that it just put those things there by itself, and the user was too uninformed or lazy to strip the text back out again.