BUT is does not completely eliminate the problem, because the properties of the cause is not a simple minimum phase problem. As
@j_j points out above, sound waves have a pressure scalar component and a volume velocity vector, and those are not necessarily in phase. In a standing wave they are out of phase so that where you have pressure cancellation, there is a velocity maximum.
It works well enough to even out freq response and reduce resonances down to levels that are very acceptable, for the practical use of listening to music. It works better at lowest freqs, and eventually above say 200Hz no longer works. For very low f, it works for a some larger area, say you can move a seat or 2, further up in f, you may still move your head, but if you move your listening position your minute adjustments and effort to reduce ringing in the 100-200Hz range no longer works.
It is possible to use multiple sound sources to get better control of the soundfield, and this can give a much more even performance across the whole room, but this is not so straight forward as to just eq for a flat frequency response.