You do know they have a life right? They're not obligated to make updates frequently for anyone, it's just a hobby he likes making.
This is not some big project VN or something, this is just 1 person that likes making VN's and showed it to the world.
Is his update schedule wack? Sure it is but that doesn't mean you can decide on which person can or cannot make a VN because of their time management, like who knows maybe he got some problems in life that he needs to sort out before having free time again to make an update.
Also VN's are just a game you pass time with, not your life centered around it. If you really want to and wait for 4 years just for a single update then you have to get a life or just read some other VN's.
Note this is a work of 1 person and they can do whatever they want with it and it is not our place to judge him or his time management
Also if your going to give constructive criticism, be nice 🙂👍