Looks and sounds like the generic trailer on the laserdisc and not like the rarer President's day weekend one that is on the DVD.
And i assume the youtube video is taken from the laserdisc as well because the quality is abysmal, if slightly better than the archived versions from the star wars site if anyone still has them.
No place in existence has any of the trailers special edition or original in blu ray quality high definition. And seeing as such official versions don't exist, people only have what Lucasfilms furnished them with or fan made recreations.
I know considering we did not even get the real versions of the films on blu ray expecting them to have the trailers is asking for a lot.
Thorr as a fan is obviously scanning a print and restoring a trailer in HD, my comments are no slight on that work only that Lucasfilms is so lazy.