m.r.a.z.23,
I would take it that the VCTS does impose the operational requirements. There is nothing in the rules about distances. You seem to be somewhat hung up regarding distances but I suggest they are a red herring.
The rules simply state "TS at the destination". Does "VC" constitute "at"? My reading would be yes, on the grounds that any weather mentioned in METAR, TTF and TAF would be intended to be considered "at", as that is the whole purpose of those reports/forecasts.