Me too. The way Filter Guy (more or less) stated it, there's lots of wiggle room in the test parameters.
There's lots of frustration for us at this level. Even if you have some inside source ..or get someone that sounds knowledgeable on the tech line, without it in print it could all be a mistake or misquote.
Even where someone like Amsoil actually gives you a beta number indexed to a given particle size, you don't know the other test parameters (flow rate, injection rate of the test dusts, etc).
..but..that all being said, the better premium filters tend to be the finer filtering (upper end Frams appear not to follow this).