Whether CBC is actually neutral and non-partisan is something of a perennial political issue in Canada. I personally would say it is. A lot of the country disagrees. The opposition party wishes to cancel it. Opinion polls indicate the public believes it to be the most partisan major broadcaster in Canada.

Twitter will be wading into some very turbulent waters if they're going to start deciding which public broadcasters are "editorially independent" and which are not. Especially since there's no real consensus on the question in some of the countries which run them.