Nope. A person walking armed BY ITSELF is not a threat. A threatening move needs to be made. Since open carry of long guns IS allowed.
Texas law is specific in this. You have to be able to assert that the assumption of threat was reasonable, AND you can't be the instigator.
In this case, Perry instigated by running a red light with his car turning spinning his wheels and honking into a group of protesters. He admitted that the other guy had his gun pointed at the ground and wasn't aiming at him. On top of the fact that he fantasized online on doing exactly what he did PRIOR him doing it, and the fact that the other guy's weapon wasn't ready to fire in the first place.
Your version of self-defense would basically make it impossible to prosecute anybody who shoots an armed person in Texas since you don't think it necessary that an actual threat needs to be established. Just carrying the gun is enough. Hell: you define threat so loosely that self-defense can be invoked with all shootings.
By the way. Kyle Rittenhouse shot 3 people. Something I see you defended. The first person wasn't armed at all. He had a plastic bag. That's it. So even being armed isn't something you feel necessary for self-defense. You don't care he put himself in that position with the express purpose of confronting protesters armed with a long gun. Why is that?