Hi, nickrulercreator.
I'm not personally interested in producing YouTube content, but I recognize it as a valuable forum for explaining things. I'm simply not talented in that area nor do I have the time to do it. The site began as a place for me to accumulate the answers I'd been giving out again and again, so I chose a format that worked best for me and for that purpose. That was 20 years ago, however.
As for you illustrating the Clavius website content with your own work, I don't have a problem with that as long as it's clear in your presentation whose work is whose. Several teachers and other content producers have reached out to me for permission to use the site content. The rules are the same in all cases: be accurate, and give appropriate credit. If you desire, I'd be happy to review any work you do, but I have no desire or energy for debate on YouTube's terms. You're on your own.