Well just read this :
On average, a python programmer like him could do 100k$/year easily. If he finds a good company who needs his type of programmers, he could also do more. He also has got to eat, alright. Both ways, the job and this game is a money grab. He's also got to pay taxes, food, perhaps rent, healthcare,entertainment,pc,visual novel packs,etc etc.Just a one man team.
And the game ain't short like your penis, it's kinda big. You may be a patron, but you gotta chill for a bit. Try not to be a dickhead and stop bullying these type of game devs.