Of course Trump's wrong about the wildfires and about the forest in general.... stupidly, hilariously wrong.
But, he is correct about the fact that most of the water that falls in California goes out under the Golden Gate Bridge, and that it's mostly due to the power of the environmental lobby in this state.
https://valleypbs.org/tappedout/
The best documentary I've seen on the issue, it's 3 hours of California water history, the "rights" issue as related to water, the water projects of the past and how the allocation of the water from those projects has been changed over the years, plus a one hour panel discussion.
Watch the first three minutes or so of the first episode before you blindly shoot it down.
I grew up here in the valley, we still own some farmland here I've been watching the water issue my entire life. It's gotten to the point of endangering our food supply if nothing changes soon.