Right now, your only options are to buy sorghum extract and brew without any specialty grains or malt your own sorghum. Only had one GF homebrew & it tasted much like commercial GFs.
Most online stores carry the extract.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk