Netflix branding is routinely applied to content that Netflix has licensed for distribution in only part of the world. Their FAQ[1] suggests this is because Netflix wasn’t available worldwide at the time, but I’ve seen some internationally-produced shows arrive on Netflix in the US as originals when they aren’t branded as such elsewhere.
"Netflix original" at this point literally just means "Netflix is showing this show for the first time in this particular territory." And nothing else.
1. https://help.netflix.com/en/node/4976