"As only Orwell could, he marked the BBC as he left – almost prissily: ‘I feel that I have been treated with the greatest generosity and allowed very great latitude…on no occasion have I been compelled to say on air anything that I would not say as a private individual.’"
That page does not seem to support the claim that 1984 is about or relates to his time at BBC.
The recent HN front-page post linked to Asimov's review of 1984—Asimov claimed it was Stalinism through and through (writing the review in 1980, FWIW).