Do you really think they will make a publish statement about this? Call them and see for yourself. There is absolutely no Stir Shaken verification of any kind other than a look up in the robocall mitigation database where each VoIP business self attests to complying with inquiries and other fcc robocall regulations. Takes 5 minutes to create such an entry for your VoIP company and nobody checks it
I have a very successful VoIP business, why would I blow the whistle? A couple months away from finalizing our Stir Shaken certification, no need to mess things up ahead of time :)