No its not linux hosted AROS.
I personally was disinterested until I noticed who was working on it.
Between them theyve written the aros kernel, ported and enhanced it for x86-64, ppc, arm, bakported enhancements to x86, ported aros to the sam boards, written intel, ati, nvidia, vesa drivers, written aros 3d subsystem and drivers, and a shedload of other stuff that typing on a phone makes me lose enthusiasm for typing.
This is no fly-by-night/marketting operation, but real work done by developers who have helped shape aros into the usable system it is today.
As already mentioned the text on the website is nothing more than placeholder text. Given that the initial releases are soon Id expect it'll be replaced soon with something more accurate.
As a longtime AROS user and software dev. Im personally pretty excited about the potential ARIX brings for AROS, although Im also expecting it to invoke quite some misunderstanding and/or misinformation.