In the article you linked, there are three paragraphs about Meshtastic in a 150-paragraph newsletter about several topics. The criticism seems to be that they they use digipeating, and then it refers to a Fedi thread[1] which is more coherent but still fairly vague. The upshot seems to be that flood routing doesn't scale, which is a fair criticism but feels disproportionate to the level of vitriol against the project.
The Fedi thread also adds that the Meshtastic founders were rude or unprofessional to him but doesn't cite any specifics or evidence.
I see this a lot with Meshtastic. People keep saying the founders are toxic and disrespectful of the community but it's always in these vague terms so I don't know what's driving it.
But specifically in this thread, I agree with sibling poster that you're being disrespectful and arguing ineffectively by pointing to such poor resources and then blaming other people for being unconvinced or confused.