I've been a Patron on a few projects over the past few years and - I must say - if I am expected to 'support' on a monthly basis, then I have the expectation that, at the very least once a month I'll have something to chew on. I can, of course, tolerate perhaps one month or - if I really push it - up to two months without any new content released; and still pay. I've done it before, but I got burnt in some cases here and there (it's not common though, most Patreons I've supported over the years do provide new content every month to justify the monthly support).
The main issue, however, like others have stated here, is that we're going through a period of complete radio silence. When you're a Patreon and have a 'support base' (the Patrons) you're effectively doing business, essentially. If you don't stay in contact with your consumers / supporters, they leave; and in some cases they demand refund (just a way to say that in the business world if you're your own boss and do business, might as well do it well, or your ship will sink but you won't bring your supporters with you; they'll find another boat just fine).
From what I understand it's not the first time that HenryTaiwan stayed inactive and silent for weeks (or months). If there's a history in his case of doing this sort of thing then it should already be a red flag, unfortunately. If you're a Patron for his project don't feel bad for cancelling membership for the time being. You're always free to come back eventually and support again if you want. But HenryTaiwan needs to communicate what's going on to his supporters. He's not doing this for free, but that's the tricky part: you wouldn't do it for free, but you depend on your supports supporting you to start with to receive said money to provide the willpower and reasoning to work on this project; so treat your consumer base with respect, first, the rest will follow.
It's actually possible that HenryTaiwan has been working on 'stuff' in the background. The problem is: we don't even know that if that's the case. We naturally assume the worst first (that he's simply inactive and hasn't been working on his project at all, for all we do know).