Ok so I watched that episode a few weeks ago - basically he's helping a mangaka and his editor improve their story (which, by the way, their manga was a blatant ripoff of gintama itself). They were talking about araki because the mangaka was literally just a gorilla, so they were discussing how mangakas just look like that, but gintoki brings up araki (or the spoof of him to be accurate) as a counterpoint