Nonsense. The "erosion" on the main spillway was a huge crater many yards (meters) across, with increased flows spewing additional chunks of concrete into the air and into the Feather River. As the inflows exceeded the outflows (65000 CFS out, 120000 CFS plus in) the lake went to 100% and over the emergency spillway. The erosion on the emergency spillway threatened to destroy it, and they had to up the flow on the main spillway to 100000 CFS to start lowering the lake levels. There is now a HUGE crater at the end of the main spillway, and not much left of the main spillway below that point. Basically, they would have been able to manage the water IF they could release water from the main spillway (it can handle 250000 CFS, but that would flood the levees downstream). They could not. When it became clear the emergency spillway wasn't up to the task, they opened up the main spillway to just below levee-flood stage, which effectively assured the destruction of the rest of the lower half of the main spillway.
The big problem they have now, which is little-discussed in the media, is how long can they hold out. The rain season still has a few months to go, March is typically the wettest month, and the snowpack in the 6200 sq mile Feather River basin is about 175% of normal. Every day they run that main spillway at 100000 CFS they erode what's left of that hillside, and they have no option but to run it at that level if the storms keep coming. If the hillside erosion starts breaking off more of the main spillway it could threaten the integrity of the spillway gates, and then they're really in trouble. That's part of the reason they're desperately trying to shore up the hillside below the emergency spillway, because they might have no choice but to use it again soon.
Of course, even though much of California is washing away, just last week the Sacramento bureaucrats declared we're still in a drought. Bureaucracy and regulation is a ratcheting mechanism--it only turns in one direction. I'm sure they'll announce we're still in a drought next month too, even if they have to make the announcement from a rowboat moored to the top steps of the Capital building.