AnemoneRosie
I suspect that someone deemed it a Thoth relation for the fact that the lwb includes some Thoth keywords - 6 of swords relating to science, for example.
I highly recommend this book https://www.amazon.com/Motherpeace-Tarot-Playbook-Astrology-Cards/dp/0914728539 in your quest to learn this deck. There are a lot of interesting and fun exercises, and the astrology part is very helpful too. But I do think it helps to have all of the books associated with this deck, they all give you a strong sense of the ideas shared between the two women who created the deck, which helps quite a lot in giving insight into reading with it.
Once you get used to the round cards and how that plays with the energy of the card being read, it's not terribly complicated.
I really want to get as many of the related books as possible. I currently only have the guidebook, and it's good Does anyone have the Motherpeace Ritual book? I think that sounds brilliant!
I'm going to get the other books as soon as I can. I'm seriously thinking about doing a 6-month intensive study of this deck. I've never done a study of this kind before but I think it's going to be the best way for me to truly get the most out of Motherpeace. By "intensive study" I mean using only the Motherpeace for 6 months. In reality, though, maybe I should just commit to doing that for one month to start with, then expanding to another and another month if things have gone well for the previous month.