Well they did say read at your own risk!
More for the benefit of newer players who read this, if a teammate asks you for an engineer, you aren't obliged to provide it (although it's often a good idea since what also often happens, as described here, is they can get very angry about not receiving the engineer). If they then ctrl-K their ACU in response to your refusal (as described here) they're breaching the FAF rules and you can report them.
The above is a big reason why for a long time I liked playing Astro craters out of the 3 maps that seemed to be played on FAF (Setons, Gap, Astro), since at the time 4v4 TMM wasn't a thing and I really dislike maps where your team expects/demands you to play a particular way and you dont have the freedom to experiment with your own battle plans.
Fortunately now I have TMM and while a few maps there might be an expected air or navy slot it's fairly rare to get pings as described in the OP.