Hugh I would take your paragraph to mean an ATC clearane of 'make descent speed 300kts' does not relieve you from the 250kts below 10000ft. ie (as you quoted) A speed restriction greater than 250KT issued above 10,000FT does not vary this requirement.
A statement of 'cancel speed restrictions' means exactly that, there are no speed restrictions for your descent. From a purely practical point of view this appears to be how ATC interpret this, as this is the clearance they often give.
I have thought that the term 'cancel star speed restrictions' is an odd one in Sydney, as the 250kts below 10000ft applies even if you're NOT on a STAR. It would make perfect sense in Adelaide, where the 250 below 10000 only applies on the STAR, and therefore is a STAR speed restriction.
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