If you don't have race driver instincts, then don't drive at race driver speeds. I would say from experience 50% of trackdayers drive faster than they are capable. You only need to stand at one corner for a session to pick them out.
I'm not claiming to be a pro, you can see from my racing videos that I'm far from it, but driving at race speeds on a trackday where you are liable for the consequences of any incident you cause, is asking for trouble.
I'm going to suggest that the guy in question was travelling too fast, it's the first corner at Snetterton, mid to high speed corner in any car, the spun car was in the gravel so visible well in advance (even if yellow flags weren't). The only way you would hit that is by having your own accident by driving too fast for your own reactions. If there was an underlying factor such as fluid on track then we wouldn't be having this conversation.
Not pretending I'm god, and I do sympathise with the bloke, but what's happened has happened and he needs to face up to it.