It is worth emphasizing that weak measurements only (and can only) apply to ensemble averages. They work by making weak measurements on many copies of the same system (or equivalently, many identically-prepared systems) and then drawing inferences about "the system" from this. But it is not, in fact "the system" but the average over many copies of a system.

Bohr would likely have made a big deal over this, because there is no actual measurement on any single system that corresponds to the retrodicted inference, and that matters a great deal in Bohr's quantum ontology.