I mean it was a special chapter done for the readers, this is basically a fanfic chapter. For a gag manga it wasn't that bad, there's also a chance that the author purposedly picked one of those few foreigners that sent their photos to him (that would also explain a bit the foreigner related joke about the made up adress) to fuck Agawa (so if some jp fans would later end up complaining for the realistic portrayal, he is still probably safe since they didn't do anyhing risky). I still don't get why send a full body pic if the author only copied the faces, well he got some blackmail material from those folks i guess.
I repeat, for a gag manga it wasn't that bad, and this manga seems to have lost its plot so it was kinda ok(?) to make it, but... is this really not numbered like a bonus chapter? Like if a jp folk ends up buying a volume of this story he would just find this chapter in between the """story"""? (I really thought he would have made this chapter as a bonus for the volume version and not make it like this)