Compromised != Hacked. To clarify: no accounts were accessed by the hackers, but small amount of account records have had passwords encrypted with outdated algorithm (basically SHA1 + salt), so we preemptively reset their passwords and sent out emails to all affected users.
This is how we define "compromised" - people which had their passwords hash with old algorithm, which is relatively easy to crack.
This is how we define "compromised" - people which had their passwords hash with old algorithm, which is relatively easy to crack.