Not too surprising to me but indeed, IMHO, close to the limits of what RTCs can do. It was not likely but it was still possible.
I trust my cats just fine with tank-mates that cannot be swallowed AND in a large enough enclosure.
Moreover, again IMHO, there is most usually no reason not to trust many cats, like the large Doradiidae, Auchenoglanis (giraffe), IDS, etc., even well-fed Leiarius, IME.
I've had great many losses too and still do and still learn. My most painful one came when my 2.5' TSN killed a freshly-introduced (into a 4000 gal) $300 1.5' Jardini arowana to get which I had to drive 8 h one way.