It is known as the scrub python more commonly. There are different subspecies and Nick Mutton from INLAND REPTILE works with a smaller locality.
I have never seen anything about them eating fresh water crocs. They are quite arboreal I think those reports may be confused with the olive python or the water pythons.
If you look up "scrub python" you will find a lot of info.
They have potential to get long, but they are relatively slender compared to other giant pythons.
I wish I had the space for one.
I have heard of a scrub Python before. So is a amethyst just another name for them?