statistically significant amount of whistleblowers are actually just liars … When their lie catches up with them … decide to end it all"

This is a very unlikely situation.

These stories of nefarious liars abusing poor defenseless corporations would be publicized widely if true. We’d have prominent, well known examples.

This needs people who think the threats and reputational damage of being a whistleblower are worth it for the ‘recognition’, who are smart enough to construct a believable sounding claim but not smart enough to see the inevitable consequences. That specific kind of person is going to be much rarer than people who work for a legitimately shitty company and don’t like it.