The usage of the term “alternative to adblue”
is a bit of worry
Indeed.
And yet the second link specifically says it is "a suitable alternative to PSA Particulate Fluid 973665, 997995, 973685,973686, C973685, C973686"
Although I note that is a seller of the fluid, rather than the manufacturer.
I can't seem to find an MSDS for it which might give a slightly less biased view.