So I can't speak for the credibility of the game or dev, but I think that screenshot is taken a bit out of context.
Dofs statement does seem quite sus looking at that context tbh lol but he lowkey was just thinking of a way to promote the game. I havent known Dof too long either but he seems to be a pretty solid guy from the time I know him and in recent talks he has even told me he has considered quitting game... so take that for what you will.
Also isaacs response there did seem legit as he did say "you'd really have to want to buy/sell"
If it was something truly shady they could have kept it private.
I do hope the owner could just own up to copying a lot of the code from idle hacker if it is true though... and possibly compensate him somehow maybe with partial equity or show support in his game.
I personally play both and both games seem cool. A lot of idlemoor does seem to be a copy paste of idle hacker but there are some random events that pop up that i think adds a fresh approach to these idle games.
Sorry for the TLDR just didn't want things to be taken out of context or Dof to be seen in a bad light as he has just been a solid dude in game from what I can tell.
xtrade channel in game chat did have some chatter mostly from Dof overvaluing currency I think, only seen it briefly so unsure of timeline.
I made a very similar comment to this in the discord casually chatting with another player and got banned from the discord, and in game lol. I mentioned how there is now a lot of new stuff that differentiates it but before this launch it felt closer to a 1:1 copy, cited some evidence that it was copied that was presented by idlehacking dev regarding code mentioning duplicate terms, like masterwork being referred to as compile in the code, something you can see front end even in his own trailer video for steam:

and how if it were copied, if he had just credited IH he probably wouldn't have got the angry mob response he did.
Got a reply in discord accusing me of spreading lies, and a wall of text related about him being tired of the accusations, how he had just spent 20 mins in game helping me by granting me 8 hours of offline progress that didn't occur when I logged off overnight and within 10 mins was banned from discord, his responses deleted (mine too of course), and banned in game lol. Was sad about missed xtrade/fg at first as I had 500m at the time of ban but aside from the one new account posting around briefly it doesn't seem like there's any interest anyway.
Anyway, careful mentioning your POV publicly if you don't want to be banned from the game because it aligns very close to mine lol.