Also, Cameron is adding stuff WITHIN THE YEAR IT WAS RELEASED. It still reflects his mindset at the time. Like how Lucas re-mixed the film a month after it was out. Plus, these scenes were from the original production, not revisions invented 30 years later, another crucial distinction.

I think if you tweak the film within its same release to add deleted material, it doesn't count as "revisionism". Many movies are minorly re-shaped like this, in response to audience reaction, box-office, or whatever. Not so much these days, but before the late 1980s this was not uncommon.