Let us not get ahead of ourselves here. PHB does not need to understand anything about Wally's statement to correctly interpret how much work Wally has done. I doubt PHB could mentally process that statement, in any case. Rather, PHB's narrowed eyes and pursed lips reveal his suspicion of Wally actually doing anything that needed such a long sentence to explain.
While Newspeak is the thought-restricting language described in the novel, Plainspeak is the literary form that Orwell advocated to make English less cumbersome while increasing the capability to communicate.
I have worked for one such company wherein my boss constantly talked about framework and called his lies as "forward looking statements" .
Such things are illusion for the management to seem ridiculously far sighted and busy. Hats off to Waly.