I don't think Dan is proud of this at all. I actually think he's terrified/embarrassed, at least that's what his reaction makes me assume.
1) He tried not to bring any extra attention to it by not actually tweeting about it, only replying to people so that only those who check his replies see it. He could have easily tweeted a short statement that the track on iTunes isn't intentional and maybe made a joke about how high it climbed. If he was proud or wanted it to climb higher, that would have been a way to let people know and possibly get more people to buy (as a joke).
2) He did reply to quite a few people, making a lot of jokes. IMO it looks like he's trying to really drive it home that the track is just a joke and really wants to make sure nobody thinks he wanted to sell it.
I guess he's afraid some actual musicians listen to it, now that it's a top 10 song and that's probs not the kind of attention he wanted from his senpais.
Re: Dan knowing about IDB (yes, late, i know)
If there was ever a time for him to find IDB, it was while writing his roast. Didn't some people say that Emma's roast was basically her GG thread in a nutshell? I guess GG would be the first place for a youtuber to go to when writing their roast, so isn't it quite likely that Dan checked out his GG thread? If so, how likely is it that he realized it's unexplainably dead and found IDB?
And i agree with those saying he wouldn't like this place. Well meaning or not, the archiving alone is gonna make him hate our guts
