Damn right he is
The Chinese PLA still trains bugle call communications, because unlike radios they can’t be jammed.
relatedly there are people whose whole role in the military is using quadbikes to transport messages in times of war, because it’s basically impossible to intercept such messages.
skill issue (whoever made their radios)
Eh. Even DSSS or FHSS can be jammed, you just need the right equipment with enough power.