We know that protection was installed after 2018 midterms:
Drop 4620:
10. Promote mail-in-voting as only safe method _bypass NSA election security [installed midterms +1].
Drop 4446:
What happens when [D]s can no longer cheat electronically?
Push vote-by-mail?
LJ dug up the NSA tweet here:
http://freerepublic.com/focus/chat/3871201/posts?page=226#226