Did you read that they moved away from Manjaro? So pamac is not going to cut it. How does pamac help them on Fedora?
Many of the recommendations are to install EndeavourOS where your pamac instructions would work ( although pamac is not installed by default ).
In EndeavourOS, “yay -S syncterm” would work out-of-the box on a fresh EOS install. No need even to “enable the AUR”.
In my opinion, that is even simpler than what you are proposing for Manjaro. And since EOS uses real Arch packages, it is less likely to break or complain about package versions than Manjaro is.
I used to use Manjaro. It broke my system and I had many AUR problems. To my ears, Manjaro is bad advice. I am a happy EOS user for years now.