It's not grammatical. He literally means to say "density" he says it multiple times even with the destiny tag at the bottom.
English
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Ya... I noticed the tags. I got the joke. I wasn't the one saying I didn't get it. That was you, remember? And you we're correct it's not a grammatical error, I was generalizing these types of situations, but nice technicality. It really was a critical piece of information that changed the flow of the conversation right? No? Anyways, what is funny about these topics are the comments of people overacting about the most simple of posts. There's nothing funny about the initial post in itself, just the reactions he is getting (and his responses). If it worked that the op turns funny... If people caught on and didn't respond negatively it was pointless. That's that humor and the only point of these.