I strongly suspect the anon in that screencap of yours has never actually released a game themselves. Hell I haven't read the thread in question but from what I can gather from the context I'm feeling sorry for this anon whose just trying to make a cool mech game and is getting crap from this pretentious faggot who tells him he's not making anything successful unless he's a "Japanese giga-autist who eat, sleep and breath mechanical design".
Having interesting or unusual sources of inspirations for a game is great, but actually knowing how to make a fucking video game is infinitely more valuable and what is going to be what makes or breaks a video game project. Especially since your biggest challenge as an indie developer is actually getting a finished product.