That manual is written by Jordan, but the key point is not the manual, it's the software and protocol.

JS8Call has a few bits it can devote to "special" group calls that save a lot of bandwidth, and saving bandwidth improves how much you can send in a single cycle, improving both communication speed AND fidelity. But there are only a few of them because they are limited by the protocol design, so Jordan necessarily has to be selective. He chose to devote one of those to a group with christofascist and insurrection ties. That is an implied endorsement, or special assistance rendered to that group that turns off a LOT of hams. It's quite literally baked in to the software. If that doesn't bother you, fine, but I hope you can see why many of us would rather just stay clear of something like that.

The relaying is also a problem. Though most people don't automatically relay, it's worth being aware that if you turn that feature on, you could be carrying water for AMRRON. It could also be illegal at a point. Without the network features of JS8Call, it doesn't actually bring a while lot of fancy features beyond existing digimodes.