It seems like Bryan has a small cast of characters he fixates on which he then uses to repopulate the rest of the world. Him seeing Fred Fuchs on Kiwi Farms is the fourth instance I've heard of him doing this:
Accused
@BSV of being a pedophile he had found named Vidar (Bryan was of course fighting with Vidar).
Accused the DSP "Detractor" Wardogleader of being the DSP A-Log DeadPylons (Bryan was fighting with DeadPylons).
Accused
@JackDavis of being Tevin (I don't understand his reason for this, other than that Tevin was a figure in his small world, who must therefore be everywhere. Bryan believed that Tevin, acting under his disguise as JackDavis, "will sperg at you" if you mentioned his true identity, and "lurks me hard and spams negratings").