I would think that would be more Lynn's forte.
It's clearly the United Kingdom, because there is no Nicktoons channel in Australia/New Zealand.
It looks like there's more Loud House episodes airing in another country before the US on October 21. I don't know if it's still Australia, but the time says 17:00, which would be 5:00pm in US time, so it's another country airing this first.
Morag should have done the same thing he did in the movie
I doubt that episode will air at 3am if it aired in the UK first. Episode premieres for the show in the UK usually happen at 5pm. Keep in mind also that another episode, called "Diss the Cook", is airing in said country first that day.