Hi Sue!
Well, that is an indication that you can never stop learning! I've never come across this terminology and while I'm quite happy to accept it, but from the days when we used to buy (and sell) the similar shaped bottles from Mdina, when they were represented by Dexam International, I don't remember them being marketed as "attenuated".
As one of quite a few people who make long necked bottles, I hadn't realised that these were quite so highbrow! Next time, I will remember to explain to my students how to attenuate the necks rather than stretch them.
I wonder if Lino Tagliapetra realises that he is the master of attenuation!