Honestly that’s how I found them. They had one of two CalMag products I found that didn’t use nitrates. The other was Roots Organics, but TPS includes more trace minerals in their CalMag products.
Not surprising some of their research dried up or didn’t turn out well when covid hit. They probably got hit with supply chain issues in addition to everything else. I wonder if they shelved it completely or if they’ll resurrect it if/when supply chain issues get fully back to normal.