The Southwest page does mention the 2018 incident and fatality, and was updated the day of the incident in fact. However, the incident isn't "numbered" as a fatal event--instead it has a UL bullet instead of an OL number, which looks like a mistake.
On one hand, AFAIK the event wasn't SW's fault at all--they'd performed maintenance on the engine to standards. The fan blades failed due to a material fatigue issue, and happened to hit the engine cowl at its weakest spot and detached it.
But I thought Airsafe still would've counted that as related to the operation of the plane, though, and the FLE for that flight would be like 0.007 (1/143) and still round up to 0.01. Since only flights with a fatality at all count for their calculation that'd be an overall FLE of the same.