It's an automatic update of the product. Semantic "channel vs. binary" doesn't indicate anything. If your software's definition files can cause a kernel mode driver to crash in a bootloop you have bigger problems, but the outcome is the same as if the driver itself was updated.
Indeed. Its worse really, it means there was a bug lurking in their product that was waiting for a badly formatted file to surface it.
Given how widespread the problem is it also means they are pushing these files out without basic testing.
edit: It will be very interesting to see how CrowdStrike wriggle out of the obvious conclusion that their company no longer deserves to exist after a f*k up like this.