Ulrich Neumerkel is like Ozzy Osbourne

Hi,
Ulrich Neumerkel is like Ozzy Osbourne.
He is making me paranoid. Especially this
F.U.D. here stole one week of my life.
Precise Garbage Collection in Prolog
https://www.swi-prolog.org/download/publications/lifegc.pdf
The test cases make no sense at all!
Take this test case run1, similar to run2
and run3:
run1 :- f(_).
f([f|X]) :- f(X).
You will never find this in real world.
Perpetual processes usually have a different
pattern of loop state transition.
Also its virtually impossible to garbage collect
via minor incremental garbage collection. We
might find a chain X=[f,..,f,Y] and collect
it. But Xn is then colored as old. And instantiation
of an old variable gets on the changed list, and
so a new chain Y=[f,..,f,Z] will not be reclaimed,
so that the beast can be only reclaimed via
major garbage collection.
Bye
P.S.: Maybe there is a chance to solve it
nevertheless via minor garbage collection, but
its very difficult. I had something in
formerly Jekejeke Prolog via reference counting.
But not sure how to bring it to a Prolog
system without reference counting.