This is not so much mistaken as it is misleading. "Made in HD" has no meaning if it was done on film. Star Wars was done on 35mm film, like most movies (and most likely Macross Plus, as most OVAs were done on 35 mm film). 35mm film has a much higher level of detail than any HD video format. Film may need to be cleaned up, damage repaired, and a new telecine needs to be done, but no sharpening is necessary. Even movies over 50 years old are quite capable of taking full advantage of of Blu-ray as long as a good film print is available.
The issue of thing not being made in HD only matters when it comes to all digital productions or edited on video. Then they're stuck at whatever resolution/level of detail they were originally made at, and no amount of sharpening or filtering can fix that. They might make it look better to some people, but in reality it only removes some of the little detail that was present. When it comes to anime, it's not older shows that can't take advantage of HD, it's shows from the late 90s - late 00s that are the problem. Most were produced digitally in SD, and they won't look any better on Blu-ray (aside from the lack of artifacting compared to DVD) without entirely re-animating the show (which has not been done for any show I know of, and probably won't be done).
As for Macross, DYRL, TV, Plus, and Seven have all had HD remaster DVD boxes released in the past few years. Bandai Visual could release Blu-ray versions at any moment if they felt like it, but they need to squeeze as many DVD sales out of these shows as possible before releasing them on Blu-ray (which is pretty annoying).