It's Prom trying to promote his coin by being sloppy at best and deceptive at worst. Having Dan Metcalf connected in any way to a coin was known to boost popularity.
I'd go with sloppy. But, we must remember this was a casual conversation and we have very little context, so we are having to "guess" what was precisely meant.
So if this is the case, then why did Dan say that Prom was ethical in one of his statements?
Also, how does Prom saying that Dan is the hal dev, after he did a supposedly unbiased code review for Hal, help boost Hal's popularity? And this knowledge was not made public until now. You realize your argument does not make any sense right?
I'm not sure I agree that we really have to guess a whole lot with a statement such as "Dan is Hal dev". You getting "Dan was a dev who was looking at Hal's code" out of that is a bit of a stretch.
But again, you could help here by being clear about what you mean by "works together", as that could mean many things.
In one of the skype screenshots, Prom said:
"After SDC, would you guys be interested in working on a project with my Dev team?
Metcalf, West, and a few other anon devs"
This shows that Prom and Dan had a much closer association than just simply Prom asking Dan to look at a code. As stated, they were a team. This is what I meant by "works together".