Being that there are anatomical differences from person to person, I don’t see how it is possible for one way to be “the right way."
If the writer of this statement believes BE is promoted as a "correct" embouchure setting that works for everyone, I agree that it's impossible to be "the right way." Fortunately that's not what BE is. In fact, theory and practice, BE is quite the opposite. BE is not an embouchure; BE is a set of well designed exercises that develop every embouchure.
One of the specific reasons BE works for everyone, is that it is not a prescribed, one-size-fits-all, embouchure setting. The application of BE to the embouchure is as unique as each brass player's anatomy. There are no instructions in the BE book that say, "set your lips this way for the upper register", "drop your jaw for low notes," "frown for the high register," etc. The only specific instructions in BE are how to set the lips for executing the BE exercises, not for regular playing.
BE exercises "work" by extending the brass player's range of motion in directions and to degrees most would never imagine. In this ability stretching process, the intuitive brass player consciously and unconsciously finds positions, techniques, movements, lip shapes, etc. that can be applied to his/her embouchure. Jeff Smiley recognizes that the individual brass player is the one best suited to determine what does and doesn't "work" when that individual is given good tools to guide their choices. (See: I Am Not a Guru.)
See also: Why BE Works