Since they took the video off an old laserdisc master I'm 99% sure the master wasn't anamorphic, so making it anamorphic on the DVD would gain nothing. Actually, resampling by only 33% does damage to the fine details. And I wouldn't use VirtualDub for scaling anyway, since it operates in RGB instead of YUV.

Star Wars deserves a Blade Runner style restoration, but since it didn't get one, I'm glad they didn't mangle the video further by artificially making it anamorphic - I'll take the original master over a faux-anamorphic one any day. Your DVD player or widescreen TV has a button to control aspect ratio - use it.