He has almost 900 paid Patrons. I might be wrong but I really doubt this isn't his real job now.
You're right that we don't know, but given that Patreon is going to take some cut of the money and that supporters can give as little as $1 a month, I'm not confident that there's enough evidence there to be psychologically certain that the developer(s) are doing this as a real job . . . if there's more than one person involved then the money is being split, and that just increases the question of whether this would be a sufficient source of income to be someone's sole means of subsistence.
The only thing that we can be certain of is that a game is in progress until it gets a tag that it is either completed or abandoned. If the pace of production isn't to your liking (for whatever reason), then it's completely within your power to look for games that are already done.
You seem to be frustrated here, and I get that. I think everyone would love to have giant updates come out as soon as they're ready for their next wank, but given that we can't control the release schedule and we don't know anything about the developer(s) life/lives, the order of the day is to be patient. I feel like it's the least I can do given that I'm not in a position to pledge financial support.
I just feel like complaining about it like something's being done to you isn't productive and is quite possibly not all that justifiable.