I'm going to promise to make a second study video and never do it
Why would you lie about your willingness to help out?
Because the additional video is useless
It's your right to do whatever you want, but it's bad faith to make promises and then break them. You are showing yourself that you're not trustworthy.
Nobody likes a killjoy, who are you to tell me not to make pointless videos.
I think that it would be worth it. Besides, it is important that you keep the promises that you make.