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First study also injected the rats with an androgen receptor antagonist "AR antagonist flutamide (FL)". They also did not use testosterone along with nandrolone. None of the studies prevented hypogonadism in those rats.

My nandrolone years were the most productive of my life. I created two non-profits, wrote two books, and operated a clinic all at the same time.  I do not think you would call that a decrease in cognitive capacity.

If someone has decreased in cognitive capacity while using anabolics (plus, of course, TRT in combination), I think they should check their sleep quality (oxygen saturation during the night).  Androgens may affect deep sleep in some men.  Lack of good quality sleep is the number one cause of cognitive decline.