ATC would have no idea whether your bugsmasher or any other aeroplane/helicopter is certified for flight into known icing conditions.
There's plenty of A/C that are would generally be considered a no-go for icing conditions but have subsequently been fitted with an STC'd allowing flight through said condition IAW the POH addendum.
That was my understanding of the point. ATC can't/won't know of your aricraft's capabilities, so they will let you fly into known icing. ie they won't try to stop you.
But, if you survive, and CASA figures it out, they'll throw the book at you.