I don't have any problem calling those speakers vintage, since they date from at least as long ago as most of the gear that we call vintage. The grill cloth and other features date them to a few decades ago.
While we may often tend to associate "vintage" with some of the so-called "finer things in life", like vintage cars and vintage wines, all that "vintage" really means is that it is associated with past years, not that it necessarily is of high quality. Yesterday's audio junk is what we may call "vintage junk" today. The fact that it is vintage doesn't change the fact that it is JUNK!
So while I'd agree to calling those "vintage", I'd balk at calling them "classic" or "Audiophile" or anything that truly connotes "high quality".
Still, if you are trying to sell something, you describe it in the best way you can, to cast it in a flattering and attractive light. I can't blame the seller for trying! If he put in the ad, "These are cheap pieces of rubbish that were foisted on some stupid idiot years ago, that never should have been made, let alone sold, other than perhaps as speakers for a kid's starter system," how many people would buy the things, and for what price?