I have been using Phoenix on my rigs for several years from version 4.1 onwards to mine (at one time or another) almost every supported coin on many different pools. I have never seen any suspicious behaviour from any version... ever.   I have had some technical problems with a few versions which were usually resolved by the next release.

If the devs. want to stay anonymous then so be it. I don't care. Miners need to monitor their own rigs and be satisfied that the software they are running is safe.

I don't know what NH is up to here but it feels like a FUD campaign to me.

For me...it is business as usual. Running the latest version 5.5c with no issues.