Is there a chance, just a slight chance, that their video was specifically intended for drawing this reaction of out him and the predictable "Truth Social Frenzy" that would undoubtedly go along with it?
Obviously it was foolish for him to take the bait (and doesn't demonstrate level-headed leadership)
...but I'm not sure that we're living in the best time for "hey, lemme stir the pot just to rile up the other side so everyone can see how crazy they are"
That aside, is their video implying that every military member is qualified to make constitutional judgments for things that haven't even been officially decided by actual judges yet?
If the shoe was on the other foot, and another contentious issue was the focal point - guns.
If a bunch of republican congressmen made a montage video telling local police officers (who, like most servicemen, are not constitutional experts qualified to make some of these types of judgement calls) "Hey, you all swore an oath... the constitution clearly states that people have the right to bear arms, so if those governors in California and New York are trying to get you to enforce their gun control restrictions, you can, and in fact...have a duty to, refuse to enforce those, and if you see someone carrying a gun without permit, you can let them go"
Would that style of activism be well-received by the left half? (hint: no it wouldn't, because that actually happened in Oregon with Measure 114, where various state leaders in law enforcement agencies publicly declared that they were going to ignore it because they personally thought it was unconstitutional, and instructed their officers not to enforce it - the left in Oregon was none too pleased about that)
Here's how this little PR stunt they did actually plays out in the real world:
They're needlessly going to provoke and paint a target on some peoples' backs
And
Well-intentioned (but misguided) servicemen are going to get court marshalled and/or dishonorably discharged and lose their benefits
Interpreting whether or not an order from a commander-in-chief to the military is unconstitutional is rarely is something so simple and clear cut that a 19-23 year old kid can make an accurate on-the-spot judgment call.