If Predators could find Dutch, more than two decades later, on a planet of millions, if not billions of human beings, simply because of some ambiguous 'advanced technology', then it makes me wonder why all he had to do was cover himself in mud to evade capture, all those years ago...

They have no way to locate him, no way to even know he was responsible for the other creature's death and, even if they did, it would contradict Harrigan being left alone, after having faced his 'challenge' and emerging as the winner. You just want to relive a specific actor having a fist fight with a Predator. If you want that, just watch the original film. Let's have some originality.