Absolutely! Insofar as a post mortem will help others avoid the same fate, understanding the specifics of the social engineering hack is by far the most useful information they could share about what happened. My guess is that they won't because either a) they are lying about this being the underlying cause, or b) it is itself too sensitive to reveal (either about the company or the targeted individuals).
Yeah probably they first want to "patch" that social engineering hole which is probably quite challenging. Although I don't think Twitter is really to blame since few companies see security that critical and training on that is indeed rare. Security is almost synonymous with SSH, TLS, VPN and 2FA although this kind of attack has been published widely even before these technologies have been invented.