In the description, it says clearly → source: GagaOOlala
It's not a mistake. It's literally not possible to link to GagaOOLala on here. Even GagaOOLala themselves have requested for it to be added many times, but MyDramaList refuses to add it.
In the description, it says clearly → source: GagaOOlala
For the synopsis, yes. There's no link to streaming service to be found anywhere, because it's not possible on this site to add GagaOOLala as streaming service. Instead, it says you can watch it on Viki, where it isn't even available.
On the exact page you linked, it says the original network is U+ Mobile TV, but Disney+ has exclusive international distribution rights in selected territories.