The Hugos have always been a clusterfuck. Explaining all the nuance is beyond a single comment (I can’t even find a good writeup) but it boils down to the voting committee largely being opt/buy-in. If you buy a membership to the World Science Fiction Society, you get to vote on where WorldCon will be held which means you are voting on where The Hugos will be held. You ALSO get to vote in the Hugos themselves
Yes, that sounds really shitty but it is also why the Hugos are a lot more prestigious than a Goodreads award. People need to give enough of a shit which, historically, has resulted in more people who actually have read multiple entrants.
Of course, a couple years back we had the “sad puppies” incident where a bunch of racist incels basically voted as a bloc to shut down people of color and non CISHET male voices.
And… a lot of signs point toward “China” having gamed the system again. Whether that is a focused effort by the CCP or just passionate Chinese SFF fans is up for debate*.
As for excluding authors? I very much assume that is just a function of operating in China. The CCP cracking down on the event would not end well for anyone involved.
Personally? I think this is yet another indication that the Hugos, like most “old guard” SFF, can fuck off. It was just a few years back that George R R Martin rambled and talked about the good old days while butchering every single “ethnic” name on the ballot. I think the issue of “who gets to vote” is still a major issue but I also think there is absolutely zero reason that an event about celebrating forward thinking should restrict itself to an in-person gala. That shit should be going above and beyond vtubers and focusing on new voices who might have a day job because being “a full time author” is increasingly impossible for any newbies.
*: Because China actually has a ridiculously strong SFF community. In large part because there are authors who are very much pushing the boundaries of what they can and can’t say to actually tell interesting and thought provoking stories in the way SFF has always been able to.