Should ephemeral media be considered lost media?

I read an article recently about the 1949 BBC teleplay The Time Machine, based on the H.G. Wells novel. Needless to say it's... unavailable but I wonder if calling it lost is a proper designation. The BBC at the time lacked the technical ability to broadcast and document simultaneously (I'm not sure any TV station at the time did) so they knew when they made it that it was going to be a one time thing, never to be seen again. 

So please give your thoughts on whether "lost media" is appropriate in such cases.