Forward Error Correction involves sending extra data in the initial transmission so that most errors can be corrected without needing a resend. It sounds like that's what you were attempting to describe in your comment.
Thanks! If FED is standard for deep space and Musk know this (both reasonable), do you have any idea what he might have meant by "then do a batch resend of the CRC-failed packets"? Is it just that guaranteeing zero packet losses has a large overhead (surprising to me), so that the optimal FED protocol in deep space does in fact include a bit of resending?
https://en.wikipedia.org/wiki/Forward_error_correction
FEC is usually used in addition to resending.