This whole thing just doesn't sound realistic to me.
Firstly, I'm just not buying that anybody from jre was actually considering having dave on. Unless I'm overlooking something, he's not really the type of guest rogan has on. Palumbo was never a pro and is probably known more for being the namesake of how BAD someone can look in bodybuilding. RX muscle isn't a particularly popular youtube/podcast network. I looked- it has 200k subscribers and 5 videos that crossed the million mark (none of which are Dave focused). Rogan has on real names and respected thought leaders, or at the very least, people who have something current and interesting to promote. I don't think he's ever even had on someone who would be considered just an "influencer". I know Dave's fans may find him interesting, but I don't think Rogan would think he was worth interviewing.
And that letter- it's such a strange chain of events that Dave describes. It just sounds weird. Dave was in email contact with the show's producer and this prompted Chick to contact that same producer? How would Bob even know that they were in communication? Bob doesn't even address himself as the athlete's rep in that letter, so why would the show producer give the letter any weight? It's currently the most popular podcast being released- they must get a ton of mail, but somehow the producer is reading every email and forwarding all the negative ones to potential guests?
None of this stuff really makes sense. In those screenshots, the producer's email address is not his public email address or an email address from the show. It's just a regular gmail address. This whole thing just sounds like Dave got trolled to me.