It seems you and I have a fundamentally different definition of truth.
Another question so I get what you’re saying: If I build a radio that emits outside allowed frequency ranges and the FCC bans me from selling it, who is determining the truth wether the radio does in fact emit outside the allowed range?
If court decisions were always determinations of truth then wrongful convictions would be impossible.
Edit as I meant to answer your last question. The FCC almost certainly defines how they measure radio frequencies and is defining what measured frequencies are allowed and disallowed for transmission. I will say this question seems a bit like a straw man though, the realm of fact is much much larger. If a government must determine truth it often would not be based on things that can be isolated and tested.