Technically, Toyota doesn’t use 6sig, and when you say they are moving away from it, what do you mean? Because I would be deeply amused (and shocked) if the Muda, Muri people would be giving up on quality control.
Idk about Toyota moving away from Kaizen, but they certainly have moved away from JIT. Toyota pioneered Just In Time (JIT) part inventory which dramatically lowers inventory costs and makes balance sheets look far more attractive.
What Toyota realized in 2011 due to the Fukushima disaster however is that this completely fails for computer chips because the pipeline is too long. So they kept JIT for steel, plastic parts etc but for microcontrollers, power supply chips, etc they stockpile large quantities.
