the meaning of Sun-speak

Lindsay, with A Voyage to Arcturus, tests the same visionary and linguistic envelopes. In the Orwellian view of language, the reduction of vocabulary to a functional and brutal Sun-speak is seen as a means of limiting the population's consciousness itself; pruning the gorgeous wilderness of language back to predetermined boundaries...

source: Alan Moore's Introduction to A Voyage to Arcturus

Can you please explain the meaning of Sun-speak? It is nowhere to be found.

I believe Alan Moore is referring to the British tabloid newspaper The Sun, which is notorious for its simplified, often prejudiced, language.