Jaker - not quite, there's a difference between airspace speed limits and procedure speed limits. The controller can remove procedure speed limits in any class of air space (i.e. the 250kt SID restriction) using the phrase 'no ATC speed restriction'. It is still the responsibility of the pilot to comply with airspace speed restrictions, which if he is in class E-G will still require him to fly 250kt or less below FL100. In class A-D the controller can remove both the airspace and the procedure speed limit using the same phraseology as before.
It's all in the MATS pt 1.