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...We'll see if they cough up the micron rating.....
Seeing as the email only gave a percent without the micron rating attached, 'for me' I'd be skeptical even if they sent one now. The proper answer would have been to send both percent and micron level along with the now industry standard ISO test protocol. But, at least if they had sent the first two pieces together, there may have been some level of credibility. What they sent basically means next to nothing.
That said, I realize for some maybe even many, efficiency information not a priority. I'm not judging. I'm strictly commenting the proper procedure for stating an authentic efficiency rating.
As a related aside, a couple c&p of the older blue can Denso FTF with silicone adbv posted recently. While the topic Denso looks ok, I'd prefer the older Denso FTF. My .02