That last one is wrong.
If it was ever sold with a rifle upper on it, it’s a rifle.
If you bought the stripped lower, it’s whatever you have it legally configured as. Pistol to rifle, rifle to pistol.
The lower is an other until it is sold in some configuration
I think the important work is stripped
If you went on PSA and ordered a complete lower
Even without an upper it still will ship as a rifle lower and that's the end
Hank