One of the other points he made was that reviewers are really just reporting on their own adaptability to a sound of a speaker over time, rather than the speakers performance.
I think that it may have been Randy (SirQuack) that said it first, or at least who I remember saying it first, and who knows how good my memory is... Speaker break-in isn't so much as changing how a speaker performs, but giving our ears time to adjust to the new sound of the speaker.