OK I have a question (not a postulation of what did happen)
I noted among all the pictures (this event or otherwise) that landing on the engines tends to at least partially deploy the engine reverser sleeves.
Assuming the sliding forces are large enough t oat least result in an "unlocked state) would this send a signal to the engine FADEC to retard the engine presuming that the gear was not down?
This of course may be in-service model specific