[BulletsBlitz]

I'm just a noob, but, the idea of M being obsolete or irrelevant is preposterous. M, which is actually stack divided by the sum of blinds and 1 round of antes, is the most accurate measure of how much "play" is available to you and your opponents. In my opinion, it is the most crucial variable in any poker situation for determining the level of aggression or patience you can allow yourself to employ. It will never be obsolete any more than pot odds, or the fundamental theory of poker will become obsolete.

Not being able to see the context of the quote you provide, I can only assume that the speaker was perhaps referring to "red zone" inflection point play, where when your M falls below 5, your options become limited to push or fold. Perhaps that strategy is no longer as effective as it once was because it does not carry with it the fold equity it once did, now that the tactic has become part of conventional wisdom.