Lemmy is unblocked in China, at least various instances are. And https is meaningless, they don't care what particular content you access, as long as the website itself hosts potentially controversial content, you're on the hook regardless. A mere DNS resolve to a domain they don't want you to see is all it takes.
Yes, I was able to use DNS Crypt earlier, but of course that's because it's under the radar and they could block all of those servers at any time they wish