I think that 80.000$ thing he was talking about is coming from the stores function he mentioned more than ads, since there's no way one can make up to 80k just by random ads like google adsense at the bottom of their comic episode, even with naver huge traffic, unless they do contract ads.
I always think that webtoons is a good channel for selling your thing, since it has huge traffic, and those readers are not random people passing by, they are fans, so they more likely will buy the stuffs that we sell, not only comic merch, but can be anything, so if there's a button lead straight to the creator's store like they said, I think 80.000$ a month is a possible number. Too bad I don't think they will put that function in this update yet.