Hi Frank -
I'm not sure where that quote comes from but MAN's new VCR was constructed to address contemporary issues, not some notional future third runway. Specifically, the old VCR could not comply with ICAO siting recommendations with reference to its location in relation to the new second runway [05R/23L]. The original VCR required cameras to provide coverage of 05R threshold. It also had restricted views of certain new stands, including all of those to the east of Pier A on T3. And of course, MAG harboured long-term ambitions to demolish the old part of T1 atop which sits the original VCR. Relocation of ATC to the new VCR site releases that old block for eventual demolition as part of the TP. Those were the reasons for the new VCR, not a plan for R3.
By default, the new VCR would be better situated for any eventual R3 simply because it is higher and does not suffer the degree of inhibited sightlines which afflicted the old one. But, given the rate at which new technology is evolving in the field of aerodrome control, it would be unwise to plan a facility based on today's criteria around a potential new use more than a generation from now.