Let me add to my ramblings.  It is possible to build a SCIF to TEMPEST specifications and DCID 6/9 + Red/Black guidance without CSS certification.    1d1f  If you gave me 100k, I could build one in my house which would pass spec and cert process.  No one would know.  And it would be just as effective as a SCIF with the certification inside a gov/contractor facility.  My guess is this is what "they" were meeting in.  A non-certified, non-gov SCIF.