Testing NX2.11.2-SNAPSHOT, I noticed that the System Feed "Errors and Warnings from Nexus log" showed all contents with the current time (and date). The rest of the feeds seemed to work properly.
I checked NX2.11.1-01 and NX3 (Cowbell SNAPSHOT; now in Feeds called "Nexus logged Errors and Warnings") and both had the same behavior.
The details show the right timestamp, furthering my belief this is a UI issues.
I am marking the epic Rapture, assuming we will not go back and fix NX2 as hinted by the team. Please adjust as you see fit.