Yes, a "preservation" of the laserdisc should be as we are seeing it thus far. The proviso being an accurate capture (color bars would help there) and no evidence of a malformed production (unlikely -- with the later CLV's reframing having the same coloring).

On the other hand, a "restoration" of the movie, from the Blu-ray using the laserdisc as a color guide, allows more latitude. That is what PDB is doing.

The Criterion Collection laserdisc is head & shoulders above all the other releases in color accuracy. But I'm still holding out hope that this release comes closer still to the Taschen book's photo record (see page 3 for that sample). In fact, if I take the Taschen photo and apply the reverse of my LD-to-Taschen brightness (& contrast & saturation) increases (end of page 3), I get the LD coloring ..

Taschen photo top brightness reduction bottom

So, the Taschen representation seems to me to be perfect on-the-set accuracy (just because my eyes tell me so).