If it was being radar monitored for terrain and traffic clearance, as was one of the requirements for descent below MSA
Please stop the nonsense about being radar monitored. The controllers had no idea of the descent procedure the airline had dreamt up, nor in what location it was to be carried out. And to top it off, had they known, the were incapable of doing so.
And radar monitoring was not required for the introduced VMC descent. And it wouldn't have been available if it was because of the above. Another great, great element in the airlines planning.