You are right, the national stories say many are THC, not most or all. I was conflating it with a local California story, where in Kings county where 8 people were hospitalized, and all had been tied to CBD oil:

The Kings County Department of Public Health, in rural central California, said it identified eight patients between ages 18 and 60 who developed lung illness after vaping products with CBD oils they had bought from unlicensed vendors.