On the one hand I thank you for the work you do against plagiarists, but on the other hand I think you should expose all the evidence you have now. I think it would be the most honest thing to do and would save the forum the most work.
Does something surprise you? This is an ordinary useless forum troll who sits with an alt account. He is scared to present his main account due to his cowardly nature. Most of his words can be safely divided by zero, since they have no basis whatsoever.
He saw someone succeed by getting into one of the most paid campaigns, and immediately ran to look for violations from them in order to harm them as much as possible. I would not be surprised if after Dave F got into ChipMixer, then this troll ran immediately to look for plagiarism from him.
This, of course, does not justify the plagiarism of these 2 users, but ... in the intentions of this troll is not to help the forum in finding plagiarism, but to simply harm someone by searching for this plagiarism, as efficiently as possible.
I would advise these 2 users to just go through the history of their posts, and find all possible omissions themselves, so as not to continue to feed the troll.