I'm not advocating for any action from any hiker and even anyone who just lives in California. Also, your advice is sound to wait and see what conditions will be like in six months, when hikers start a northbound PCT hike. It's super easy to add or subtract gear as needed, even in the hours before a thru-hike was started. If I was going to hike, though, I would be putting together my gear list now and thinking about what those conditions might be.
What I don't understand is your rationale for doubting the science.
Here is the bio page for the interviewee, Bill Patzert.
The data that prompted this interview is apparently based on the National Weather Services' 164 years (!) of collecting information.
Those credentials seem enough to, at minimum, entertain that California might have fairly dry conditions next year.