By definition special vfr is not available in a TMA only a CTR
I have tried to research this a bit, as I it's new news to me - the channel island for instance has a pretty extensive Class A that requires SVFR. I have not been able to find the definition you refer to, but someone referenced in an old thread that you could only get SVFR in Class A that extends to surface.
It comes from an ICAO document so applies in each country unless they file a difference. Since you're interested in the Netherlands you'll find it here in section 2.
Dutch AIP
Note where it says
ATC may, under certain conditions, authorise special VFR flights within a control zone, when the flight visibility is not less than the value specified in paragraph 2.1.1.
A control zone by defination goes to the surface up to a specific altitude/level. As a TMA or CTA is not a control zone, SVFR isn't available in it.
I hope that helps clear it up a bit.
dp