I am dumb in asking this, but how can I message (or private-message) the YouTube channel LegalEagle?

It’s a YouTube channel made by a lawyer who actually reacts to many movies and TV series (among many other things). Anyway, I wanted to send him a message, but, as you’ll probably know, YouTube Messages was cancelled 2 years ago. He has a Twitter and Facebook account, but for Twitter I don’t have an account (but if there’s no other solution, I will create it), and of Facebook, which I actually checked, he has LegalEagleReacts, but the problem is that even there there isn’t a PM feature. I could view his email address but that is available exclusively for business enquiries, so to PM him there would be completely illegal. So, what should I do? By the way, here’s the link to the YouTube channel, and his Facebook and Twitter accounts:

https://www.youtube.com/channel/UCpa-Zb0ZcQjTCPP1Dx_1M8Q
https://www.facebook.com/legaleaglereacts
https://twitter.com/LegalEagleDJ