I disagree with those who says that Eckhart's teachings are not Buddhist or Eckhart is not enlightened. It can be true that Eckhart didn't become a Sakadagami immediately as he describes in his books(but it is possible that he became a sakadagami immediately too). But whether he immediately become a Sakadagami or not doesn't matter, it is not a difficult thing to recognise his purity right now. Also Eckhart teaches mindfulness in essence in his teachings, but also teaches things like inner body awareness, or breath awareness to make the beginner meditator's mind calm a little bit. But the core of his teachings is mindfulness. He leads people to give attention to whatever they are doing. Looking, listening, walking, washing the hands, driving, observing the emotions or whatever..This is clearly mindfulness So just looking from this side, Eckhart's teachings are very aligned with the Buddha's teaching.
Ofcourse Eckhart's many descriptions about the nature of the reality fits more with Hinduism. He speak about one consciousness, god etc. So yes from just looking from this side Eckhart's teaching is not aligned with Buddhism.
But we must not forget that Buddhism's main goal is to make people experience the nature of reality themselves. That's why Buddha who was a very intelligent being wanted to avoid people to transformavoid transforming Buddhism to a kind of a worshipping or studying based conceptual belief system.
To sum up, from the experience level Eckhart's teachings are very aligned with Buddha's teachings and from the conceptual level Eckhart's teachings are partially aligned with Buddhism.