I'm not saying he is in the right.. Far from that. As far as the mental health goes, indeed some are claiming it a crutch/excuse.. But on the other hand.. I see no reason at any point he would have to disclose it.. His mental health is no ones business on a on line community. Should he replied to his thread sooner? Yes.. But, it also points out by not doing so, these conditions are most likely real. Like you said as far as his health, only he knows the truth. But until someone can prove otherwise... That's not just about Jaxel, but anyone who suffers from these sort of conditions.
I get what you're saying and I agree people shouldn't joke about it but we aren't wrong for claiming he's using it as a crutch/excuse. It's not bullying him, it's not bashing him for having that illness. If it is bashing, then it's bashing him for being a grown up who has most likely had it his whole life and still can't function with it, while that may be mean, I don't think it's unfair. If someone is legitimately insane and they do something awful, people still get to tell them it's awful and point out that it's not ok despite having that disease.
I don't think it's unrealistic to ask someone to disclose the fact they don't work well with deadlines and don't have good customer skills before taking on a project with deadlines where people are going to want periodical updates.
Social anxiety is a real thing as well, let's make a comparable situation; If I ask you to go to a social function with me and you bail and 10 months later tell me you don't do well in social settings, I'm going to be upset. Not because you don't do well in those circumstances but because you knew that, didn't tell me, and I could have found someone else. Instead I wasted the money on your ticket and looked like a fool. Saying you have anxiety issues doesn't make it more ok that you neglected to tell me before hand, doesn't make it ok that you bailed, and doesn't make it ok that you avoided me for 10 months.
That's all everyone is saying. If he had it under control, sure there's no reason to disclose it but if it's possibly an issue (which it seems like he should have known it was) it belonged under the "Risks and Challenges" section of the crowd fund page. As far as writer's block and not being prepared for it to reach it's goal so quickly... that would have been a great excuse, 6-8 months ago. After his trip when people were just starting to get upset he could have easily had it all under control by posting this simple paragraph.
"Hey guys, I know you're all worried but I had that trip planned before the project got funded. I didn't expect it to get funded so quickly. Please settle down, I'll be starting work soon."
Man. Even a couple weeks after that he could have said:
"Hey guys, it's a big project and I'm kind of stressed about delivering a great project, I'm still plotting the whole thing in my head. I'll be starting soon."
A few simple sentences every few weeks would have made everyone less hateful in this thread. You can't just take $100 from 73 people, bail for months, and expect everyone to still be friendly. Quite frankly I'm surprised anyone is still being friendly.