As far as I know Birkenbihl was NLP trained but didn't use the label herself for the stuff that she did. She also got a degree in psychology. She was highly paid management consultant/speaker.

While not advocating something like Quantum Healing she does have a program in which she says she teaches something "Quantum" with boils down to using things like Heisenberg uncertainity as a metaphor.

Wikipeadia notes that she was diagnosed with Asbergers.

She's not teaching something that would qualify for the label evidence-based, but then nearly no top management consultant does.