I feel "if" the decision to divert to KUL was advised by Qatar operations
it was almost certainly influenced by the efficiency of KUL compared to Qatar to deal with this particular situation.
Imagine the torrent of adverse publicity that would have been caused if this flight had arrival in Qatar with a deceased Captain on board.
The pilots widow and child and the operations management were thankfully spared a potential spectacular display of inefficiency and red tape confusion at a very sensitive time.
Passing the NIMBY situation over to a proper organised major international airport to deal with it saved a lot of potential embarrassment.