In principle, yes. In reality, its almost impossible to correct anything wrong on Wikipedia unless you publish the info in a book first, so it can only be at best a compilation of second hand knowledge. I'm pretty sure if John Fozard was alive to edit the Hawker P.1121 page his edits would just get reverted.
Now that many published sources get their facts from Wikipedia, you get crazy situations like where the Sukhoi T-50 specs from Wikipedia were quoted by poor researchers for news organisations, then the Wikipedia article updated to include a link to the news organisation's story as the new "source" of the said specs.