This reads like a case of 'all about me'-ism. It sounds like this person negotiated their salary, and then decided the company didn't value them _because_ the company agreed to raise it when asked. If your goal is to have people throw money at you which you don't ask for, you are going to have a tough time working. A company that's willing to double your salary when you point out the offer is low sounds pretty great…
This is a case of "Analogue has a history of being shady", and their attempt to negotiate this on Discord while offering a miserable pay is one more proof of it. There's maybe 10 qualified people on earth to make a cycle-accurate GBA BIOS, and they offer 20k for exclusive work for 10 months ?