Yeah, making $90.000 without providing any new update over 10 months seems totally like they don't need help.
At this wage you can work full time, which means 170+ hours a month = 1700 hours of pure development in these 10 months, multiplied by two devs, that's 3400 hours.
When people say they want longer updates, it doesn't mean they want less frequent updates. It means they want to see more content for the $90.000 they pay within 10 months.
We're even only talking about a simple 2d cartoon game here, with static maps, plain text and some drawings that got low-framerate animations. Nothing that compares to actual game development where devs have to face really technical complicated challenges.
Devs are earning decent money, yes. The game is not rocket science, ok (although I'd argue that it's way more complex than it may seem, and you only have to take a look under the hood to see the code needed to make everything work smoothly, from preventing potentially colliding events from doing so, to bringing life to those minor animations that are constantly running at the background on every single scene). But ok. So what? They've been working at this rate for 3 years now, providing daily updates in a format that has been adopted by many other devs since then due to its transparency and accountability, and they've been in continuous contact with their patrons, who are the ones actually funding the game and seem happy enough with it to keep giving their money away for a FREE FOR ALL game (they were the ones who chose to let the devs work in full quests instead of releasing partial and more frequent updates, by the way, so your last point is false: paying people do want less frequent updates, given its quality).
Devs are honest and transparent, they keep refunding pledges to those who subscribe on the last days of the month (and basically to everyone who demands it), they work together, they had a baby and they still kept developing the game when an ordinary worker would have taken a leave from their job. Many people like what they are doing and this has allowed them to make a living from this project, and they are adult, responsible people committed to it, as they have shown in those 3 years. There's no actual incentive for them to change the way they've been doing things, and I don't mean it in a wrong way, quite the opposite: I find it hard to come up with a more effective way given their personal circumstances. In fact, it seems to me that they have found the perfect balance. You don't have to like it but you won't change it either with your complaining. You can express your disagreement, you can argue they should be more productive according to your own, uninformed opinion, and you're free to not support them if you feel they don't reach the standards you arbitrarily set (as we all do). But nothing will change, and you'll get the chance to play the game for free anyway whenever it's ready.
Also, what help do you think they need? For what? No matter how much you pay her, the only artist won't grow an extra pair of hands and another functional brain to speed up her work. If you actually want to help, maybe try to copy her skills and offer yourself to help her out. Because what really sets this game apart is a bottleneck that can't be bypassed nor easily solved without the game's quality getting a noticeable, severe blow.
