I'm not aware of any scholarship looking at correlation between level of tech knowledge (specifically, ad blockers) and subscription behavior to avoid ads.
That said, apparently ~42% of global users[0] block some ads.
Given that there are ~4.6Bn users[1], of which ~1.9Bn sometimes use ad blockers, some 2.7Bn users don't use ad blockers at all.
50 million (although that includes YouTube Music subscribers as well as YouTube Premium) subscribers is a little more than 1% of total users and ~2% of users who don't use ad blockers.
I'd also point out that nations with higher per-capita incomes tend to use ad blockers less, which implies (again, I'm not claiming this to be true) that they may be less knowledgeable about ad blocking technologies.
It's not clear what the global distribution of YouTube Premium subscribers looks like, but it's reasonable to think that those with higher (and presumably more disposable) incomes would be more likely to pay for such a subscription.
I don't have any data to back up my hypothesis, as I can't find any published research into the tech savvy of those who pay for YouTube Premium vs. those who don't.
Even more, just because the absolute numbers (50,000,00 subscribers which includes 30,000,000 YouTube Music, and 2+ or 7+ billion in revenue, depending on if you count the 30,000,000 YouTube Music subscribers) are large, given the total population, they are a tiny group.
How many people use add-ons to block youtube ads? Who knows? Possibly Google/Alphabet, but they certainly aren't going to talk about that.
I want to be crystal clear that I'm not saying you're wrong, but the idea that there's a lack of information driving subscriptions to get ad-free youtube is certainly a reasonable one.
Perhaps that's a good topic for a master's thesis in psychology? Since I'm not a marketer or a grad student in Psychology, that wouldn't be something I'd do. Hopefully someone will.
[0] https://backlinko.com/ad-blockers-users
[1] https://www.oberlo.com/blog/internet-statistics
Edit: Added the missing link.