The guy actually makes some good points [shared home town, etc], but he's just too favor-grovelling (being really obsequious while also asking for a favor). He's laying out how little is needed, and logistic details - things that SHOULD be hammered out with Cavill's handlers, not used to try to guilt him into complying.
"Fellow Jersey Native Henry, I see you're into Warhammer 40K. Let's do a charity battle! We can talk about good times at the Little Shop and being from a tiny island while playing 40K. We'll play any edition you're familiar with,or teach you 9th. We're in london, so if you're interested we'll work out details!" - AKA we'll schedule shit with your assistant, and we'll grovel privately to them.
Also, even if you did meet him, you didn't have a meaningful enough encounter to remember his name. So he sure as shit doesn't remember yours (and if he did, it wouldn't be for a good reason) so stop trying to bring that up.
If you want to do these things and not be a faggot:
First way, would be to build your brand of "Famous People Charity Stream". Do a stream with local/small celebrities. You will demonstrate your ability to work with real talent and not be clout chasing annoying fanboy. Once you've got a few episodes in the bag, you should have contacts with publicists, and leverage those into getting Superman to boost your channel to the moon.
Second way would be to try to start a Charity tourny. Advertise it, get some buzz, and then as part of the publicity push challenge Cavill to something silly like a "God Emperor of Jersey" battle to determine who's the better player from Jersey.
Hell, reach out to GW and say "Hey fags, big channel here. I have a hertiage-in with Henry Cavill. Can you help me get Superman on my channel? Think of how many new paypigs you'll get."