If you’re referring to the continual technology improvement, the M4 better than the M3, then yes that’s been reviewed by others
The issue here in Soundcore is not the relative performance, but the relative price/performance. Someone owning a Sony M3 is unlikely to buy the Q30 and cease using their M3, just like someone owning the M3 won’t ditch them for the M4, as the differences in performance are incremental.
The price reduction in ANC brings it into the budget range of those who don’t own any ANC.