You can't simultaneously have that key strength is maintained as long as they don't know how many bits are flipped, or where in memory the key was, but also that leaking any number of bits is catastrophic. If your memory dump creates a different distribution on the space of possible keys, it has already compromised the cryptographic security of the key, it's just a question of how much, and the answer here is a lot - even if we had GBs of garbage data, that is still tiny compared to the whole space and can be sifted extremely quickly