Ok, see your point, but I think this is where we run up against the imprecision of GWs language. It's kinda like how they had 3 different ways to say "killed" or "unsaved wound" in 5th edition. (might still, haven't paid enough attention.
I will argue, that in GW fuzz language land, "normal BS" does in fact mean "no longer a snap shot".
In fact, I can even think of an example. LR redeemer, with flamestorm cannons, and POTMS. POTMS lets you fire "one more weapon than normal at full BS". Now, I'm quite sure that POTMS will let you fire that template after moving 12". If ti was still technically a snap shot, you could not. But that's clearly not how they mean it to work.
Same thing when it's moving 6" or less, you can fire 1 weapon (plus POTMS or other special rules) at full BS and the other weapons as a snapshot. It's not that they're all snapshots, and you're just lucky enough to shoot one at full BS, despite that.