As per CCP:
https://www.eveonline.com/article/puj0c3/nullsec-local-blackout-in-effect
As previously announced, local chat in all nullsec space is currently in delayed mode.
This means that it will behave as local chat in wormhole space, with pilots only appearing in the local population listing should they choose to post messages.
The duration of this blackout is undetermined, and we’ll be monitoring what effect this has on the cluster.