Can someone here give me some input on Toltec Teachings (Carlos Castaneda) (Theun Mares).

How is Tensegrity, Path of Freedom, The Circle of Life, Landmark Education all related to Toltec Teachings?

Is it considered some kind of a cult?

It does not appear that Castaneda got his material from any known LGAT. But someone may come up with a way to use Castaneda type material in an LGAT format.

C created what some commentators call 'New Age Shamanism'.

Castaneda did create a group and the dynamics are described by Amy Wallace in her memoir The Sorcerer's Apprentice: My Life with Carlos Castaneda.

There's a lot of material on thread

[board.culteducation.com]

Scroll through the threads and read the stuff on Castaneda.