ROB
The Rambam as he makes clear is not talking about any specific “mamar” he is talking about a general approach to aggadita.
And the relevance to Slifkin is quite simple a core principle of Slifkin’s philosophy (there are several, this is one of them) is that we in fact no more then Chazal, the Rambam makes clear both in the discussion of the second group and the discussion of the third group that someone who thinks that is a “fool” and “cursed”.
In other words completley the opposite of what Slifkin would have you believe the Rambam held.
(Mod-95 I am not that good at hebrewbooks so I can’t find the link However after ROB replies and I’ll have to post a couple of exact lines from Peirush HaMishnayos I’ll figure it out)