Board Thread:Consensus Track/@comment-3279282-20171016184901/@comment-3279282-20171116183504

No, it doesn't. There's a difference between
 * "The author makes a general statement that connects the manga and anime"

and
 * "The author lets an anime character make a cameo in the manga".

If only the latter is the case, only the character is canon (and whatever events were referenced), but if the first one is the case, the entire anime is canon.

So the entire anime is canon because of the statement and the (now canon) anime reference of Raiga makes him canon, but not the entire filler arc.