I believe it is the former, as one of the core ideas of 1984 (arguably the core idea) is that when a tyrannical power has control over language, they have control over history, and when they have control over history they have control over the present and future.
Decrying. In, IIRC, his discussion/interview with Schmidt, he discusses takedowns of Guardian and other newspaper articles as how scandals of powerful figures can go 'down the memory hole'. I believe the right-to-be-forgotten is already being used that way, to cover up frauds and whatnot.
Is he decrying that development as indicative of Orwellian reality or praising it as a positive development? (my understating is he meant the former)