Yes because that 63k goal is obviously a realistic goal that Selebus actually hopes to reach.
You and I agree it's unrealistic, but think about it this way: if that WAS his goal, wouldn't that perfectly explain his current behavior and the amount of butthurt he has over seeing his growth stagnate in the last few months? If you were only being paid 1/6 of what you thought you should be, wouldn't you also think that was "harm"?
I'm sure he'd even deny it if you asked him. "Of course it's a joke!" - because anything otherwise would make him look greedy as hell. But since he's acting in the exact way as if it were the case, I think it's a lot more likely than you think.
Also look at how he worded it - "If Summertime Saga can make this much, so can I" - that makes it almost sound reasonable, no? Maybe hinting he doesn't have a high opinion of it, and wonders why it makes so much more money than him? If it wasn't reasonable, and SS was very obviously a game that far more people would enjoy, wouldn't it be more likely to be written as something sarcastic like "Summertime Saga is totally within our reach, right guys?" And even then it still might not be an actual joke.