Most opinions you will hear from people are also just regurgitated amalgamation of things they have previously heard or read on the subject. Also, in general, being able to aggregate and summarize into words what hundreds of people thing about X seems like probably an even more useful tool than getting one person's thought, unless it's something no one has ever had any thought on before.

Even then, I don't think it would be outside the scope of possibility for the parrot to find things that are similar to X, find opinions on those, and somehow transpose those opinions onto X.