I guess it adds a second defender for the knight, but is it brilliant?
A brilliant move here is in that sacrifices material and is good or best. The knight move allows white to take your f8 rook so qualifies as a sacrifice of material.
Oh yeah, now I remember kicking myself for dropping the rook. My opponent not only didn't take it, but blundered their own rook to the f7 pawn and then their queen right after that because my knight on f6 was on h5 and they didn't notice the discovered attack or that they could have just taken the knight.
I guess it adds a second defender for the knight, but is it brilliant?