So, I've been observing the various Aurumoth sets and I've come to the conclusion that, due to the fact that it has such a variety movesets due to an insanely good movepool, I would say that it's OP. It's too good, in short. Any pokemon that gets Tail Glow, with good stats AND an amazing movepool is automatically recorded as a legend, but on top of that it gets QD and DD which make the unpredictability of Aurumoth an amazing asset that adds to the OPness of this pokemon. Also, the fact that it gets Illusion increases the amazingness of Aurumoth, due to being able to get a free buff, providing you have the right pokemon in last place, and if you're lucky, maybe even two free buffs, which on Aurumoth is basically gg. Teamed up with Heatran and Dugtrio, it makes this pokemon even greater because of the possibilities that you could run with it. If Blaziken was banned, so should Aurumoth.
You know what I have found out? If someone is running a pokemon that is faster than Aurumoth and has a Special Move in its set, Aurumoth is dead. I have found that there are not a lot of pokemon that do have difficulties dealing with Aurumoth. Of course, this is not definitive, since we are only about 12% of the way through the playtest, and any claims would be premature and without adequate education or experience.
Blaziken's banning had a bit more testing done to it than 40 hours.
Right now, we need to test out Aurumoth and examine its impact on the metagame. More tests need to be run. More sets need to be attempted. More teams need to be used. We cannot know just how strong Aurumoth really is in 40 hours.
I am trying to test out Weak Armor at the moment. Seem to be running into issues with multi-hit move users.