I think it is "uncommon knowledge" for important reasons regarding the great power of "The Matrix" to obfuscate, hide, and muddle important information and patterns of events that appear to be "evidence" of something. "Evidence" can so easily be hidden so that it appears to not exist, but this does not make it "not exist". It only makes it hard to find (rare) and even harder to see and piece together (rarer), even when found.
I think it is "uncommon knowledge" for important reasons regarding the great power of "The Matrix" to obfuscate, hide, and muddle important information and patterns of events that appear to be "evidence" of something. "Evidence" can so easily be hidden so that it appears to not exist, but this does not make it "not exist". It only makes it hard to find (rare) and even harder to see and piece together (rarer), even when found.