Is it even barely possibly that the pilot at CGH didn’t know this, or didn’t recall the point under the pressures of landing on a short wet runway with only one operating reverser? And therefore, in his own mind, used the buttons to order ‘autothrust disconnect’ and then interpreted that as ‘finished with engines,’ and concentrated only on making sure that he got hold of the correct lever for the operating reverser and moved it into ‘max. reverse’ as soon as possible? by RWA
My guess is no, not a dumb question, you seem to be very educated on the system, I doubt if a person can make it to the left seat without being more familiar with the A/TH system.