I'll reiterate again.
`trunk` is supposed to be "The most important roads in a country's system that aren't `motorway`s."
The core TEN-T network is already with minor exceptions all `motorway`.
So that leaves the comprehensive TEN-T network as the next, less important step.
Which is e.g. this very road.

(you've omitted the "that aren't `motorway`s" part when quoting the definition the second time, I *really* wonder why)

The last two paragraphs of your response are just not true.