This is the definition of "knowingly" under U.S. Code § 3729, which is part of a specific act (the False Claims Act).
There is not one single legal definition of "knowingly" that applies to all laws and claims in the US.
Furthermore, even under this specific law, you need to prove the accused acted in "deliberate ignorance of the truth or falsity of the information", which has its own standard of evidence which is not exactly trivial.
Bottom line: companies like Meta build in plausible deniability because it's legally more effective versus the alternative, even if it's not bulletproof.
There is not one single legal definition of "knowingly" that applies to all laws and claims in the US.
Furthermore, even under this specific law, you need to prove the accused acted in "deliberate ignorance of the truth or falsity of the information", which has its own standard of evidence which is not exactly trivial.
Bottom line: companies like Meta build in plausible deniability because it's legally more effective versus the alternative, even if it's not bulletproof.