These are the most relevant apps to use, it indicates that even when using security apps there is a problem. The message is "WhatsApp is not safe", its not relevant to most people why.

And it's a rare case where FUD is absolutely applicable:

Fear that using a "secure" messaging app on your rooted phone will expose you to consequences.

Uncertainty that your communications are secure when using your phone with the "secure" messaging app.

Doubt that using the "secure" messaging app is secure.

yes, it's FUD.