These guys really weren't whistleblowers, they were independent private investigators who did a great job of uncovering wrongdoings.
If Huber and others have been at this since late 2017 then they already had this info by the time these guys contacted them is my sense. And most likely have their own insider whistleblowers from the CF, CHAI and others worldwide. They didn't need these guys for what they're doing, the public needed to hear these guys first before it all drops.
At least that's my 2 cents