Yeah, some creative marketing there for sure. Not trying to be pedantic. I just think absent evidence to the contrary, this is just someone making a buck and not a real threat. So, the question is, what makes this inherently a weapon? Is it being used as a weapon to harm others? Is it marketing? Because I could market anything as a weapon.
For example, if I open up an Etsy shop and start selling Tactical Death Nails... which are literally olive drab or matte black knitting needles, would that make them more dangerous? I could write some crazy cool marketing language about all the nefarious deeds that can be done with a knitting... I mean Tactical Death Nail. My opinion is... maybe... based on what people actually start doing.
I've never heard of a vampire straw before this thread, but I've been looking for any evidence that it's been used as a weapon by anyone, anywhere. I'm not saying it hasn't... but I can't find any evidence of it at all. So, all that to say, absent evidence to the contrary, I think this is a red herring to be filed away with fear of sharks and reefer madness. I guess to address the OP's assertion, yeah, you can fool the cops. You can take your Tactical Death Nails on board a plane very easily, by putting them in a bag with some yarn. Easy peasy...