It's not nonsense, just concerns that you don't seem to have.
There is not one pertinent criticism in there. It's all meaningless drivel presented as legit concerns.
Which one is a concern you share?
I personally don't like Manjaro holding out on package updates
Then you don't use it and that's fine. The whole point of Manjaro is to mitigate the bleeding edge risk. There's tons of people who see value in that. Not every distro has to do the exact same thing Arch does. There is something of value in every Arch-derived distro.