It’s moot anyway, since they can always filter their stolen databases by potential methods of exfiltration, so the dump looks like it only used a certain vulnerability.
All we know for sure is that someone is attacking Twitter via blackmail via hacking just after Twitter released bad PR for some of the worlds most powerful hacking organisations.
All the skeptic comments in this thread seem to worry about the veracity of the claims, but that’s irrelevant to the question of would FBI/CIA retaliate.
It’s moot anyway, since they can always filter their stolen databases by potential methods of exfiltration, so the dump looks like it only used a certain vulnerability.