Sadly for hidders, they can't hide truth, just make it more expensive to find. They can't massage all data which means some data exist which reveals truth.That's how they become what Mark Twain correctly called "damned lies."
Databases with (for example) "side effects" of the Zyklon-B mRNA injection had critical data deliberately removed/hidden (such as injection status) to destroy 'context'.
It's why "All-cause Mortatlity" (even without that data) became so vitally illustrative. You can hide the cause - but not the massive information spike.
You should check Steve Sailer for noticing such things. I think he even has book about such noticing.