Well, he's obviously not technical. He says 'all the frequencies are wrong with the RIAA'. There are two time constants in RIAA pre/deemphisis. Neither of which can be duplicated with a Sontec."All" is a strange word to use if he knows what he's talking about.
Like I said the RIAA is applied inside the SAL74 Drive Amplifier Rack. In the SAB74 module. The SAB74 module has to be modified which is what they did. I spoke to a tech about exactly how they did it.