It's ran by Sensor Station LLC, email seems to be `lookout@sensorstation.co`
Also this seems to explain why everything is gone (snippet from his site winduptoy.sensorstation.co):
> we go to great lengths to avoid being tracked, marketed to, and information being sold. we started using dumb-phones, deleted Google, social media, and SaaS accounts, and self-host whatever we need. we choose open source software whenever possible and max-out our ad blockers when on the web. we subscribe to zero subscription services.
Since Slimvoice removed the Google login for privacy reasons, I'm not surprised they've escalated their idea of living off the grid. Their ideals have left us out of their great service, and honestly it doesn't bother me but they should have at least left it self-host.
If someone has contact to the author, I'd be pleased for some details.