hmmm…I recall being asked to get our cannabis bone dry before testing purposes…so that the numbers would be higher. when testing was required, but 3rd party wasn’t. I refused.
The only way I can see to get a “dry weight” on rosin would be to use 3a mol sieves and weigh what they absorbed. any other attempt at drying would simply evaporate terps. which might be what they did.
so you had 12% terps, and they evaporated that off, leaving 99.8% cannabinoids? nah, still don’t buy it…