It's legitimate. The point is that showing answers without sources makes Google the de facto "arbiter of truth". When Google's database updates its version of truth, that now becomes what is (or what has always been). There is no indication of different perspectives, or any analysis for how its version of "truth" was derived. That is very Orwellian.
It's hard to use 'Orwellian' when the entity you're accusing is entirely dependent upon other sources and exercises no editorial control.
There's a lot of trust in Google with that statement. If this changes, how would you know? That's what's Orwellian about it.
It's not hard to imagine the results being silently tweaked by Google - not to say that they will do this, but it's a real danger, because it'd be very bad and hard to detect if they did do this at some point in the future, after we'd all gotten complacent and learned to implicitly trust the results.
Of course Google could use this for political gain or some other nefarious purpose, but they rely absolutely on user trust and so it would be an incredibly risky move.
Not to mention that looking at your watch or using bing or ddg or similar tools would show you the deception. It's just silly invoking Orwell over this I think.