Well good point, Dutch did cover himself in mud to disguise himself from the Jungle Predator's thermal vision and cleverly so.
But even if the Pred may not detect the T-1000 through thermal vision, he still has other vision frequencies to select from his bio-mask, such as high ultraviolet on his spectrum or his night vision.
Though the T-1000's ability to blend among the environment will make it somewhat difficult for the Pred to track him down, i will give you that.
Well if the distorted outlines of the Pred's camoflauge is to be taken literally at face value rather than just a visual special effect for only the audience to see as opposed to the unaware characters in the movie, then Arnold might be able to spot him. I mean Arnold in Genisys was able to detect a piece of the T-1000 stuck on the lock of his truck's door from behind while driving.I dunno, they seem to have some pretty decently advanced scanners. Maybe not long distance, but I think a Terminator, at least the Arnold model, could see through the camo at a decent range.
Going from James Cameron's Terminator 2 FAQ page, he does have something called the "'Telepathic Communication Implant Cores", which can detect the presence of the T-1000 and his visors can detect weather patterns, gravity of an object's force, bullet trajectories, etc. So you might be right, but the Predator is still fast enough to hide from the T-800.
Yeah I was always curious to see what a T-1000's point of view would precisely look like on screen. That is until I did a search on google and read James Cameron's Terminator 2 FAQ page...Although, I just realized, we never saw the perspective of the T-1000s. I wonder if they have the same scanner tech, or if they had to compromise it for their liquid body?
and this is going to shock both you and I, but, the T-1000 doesn't actually see at all, but rather and I quote:going by the above, I'm guessing the T-1000 is going to need to be able to touch the camouflaged Predator in order to find him and the way Pred moves, it'd be like a blind man trying to touch a fly.The deleted scene of T-1000 searching John's room was specifically shot to show the audience that T-1000 doesn't see but that he senses, like an insect or Alien. He carefully touches and massages everything with the tips of his fingers. "Touch" is a key word here - it's the same way T-1000 samples objects.
Novelization: "(T-1000) took in the details of the neighborhood. It wasn't just his eyes he was seeing with. His entire body registered the environment in a dozen subtle ways"
"It didn't need lights. It could sense the molecular structure of things by touch"
There's no distinction in T-1000's form - same drop or part can become a piece of leg, or an ear, nose or knee - doesn't matter
Novelization: "Sirens reached its auditory sensors, which could have been formed anywhere on its body (since every molecule had the genetic blueprints for all needed parts programmed into them), but were now in shape of human ears"