[moufestaphio]

I know it's not permanent. I'm just agreeing with OP that this is misleading.

[aix1]

I obviously don't know anything about your situation, but the article specifically talks about:

"Lost baggage is when a passenger’s baggage is lost or goes missing due to an error on the part of the [Kansai] airport."

Perhaps in your case they considered the delay to have been due to somebody else's fault?