They are not making well over $1 million a year in patreon donations. They are making bank, yes, bringing in about $720,000 in the past 12 months.
They have a dev team of the artist (DC), a few art posers, a coder, a writer, as well as a couple of support staff - its around 10-12 on the team (give or take).
The game has nearly 20k images and a couple of hundred thousand lines of code and dialogue (24mb - over 1 million words. To compare, the average novel is between 75,000-125,000 words -- All 7 Harry Potter books have fewer words than the code/dialogue/script of Summertime Saga).
Finally, yes - DC is a terrible project manager. Also, one of the reasons he left corporate game design so long ago was because he hated being managed by others and dealing with corporate deadlines.