Hilton KL denied the upgrade to the second room last month
When you say they denied the upgrade, you mean they denied the occupants of your other room entry to the EL? Cause as far as rooms are concerned, the executive floor's rooms are identical to the other floors, it's just the extended benefits that differs.
Also, if you book any of the suites, you will not be on an executive floor per my experience the 10 times or so I've stayed at Hilton KL this year. As a Diamond though, I've always been given the published benefits plus more, regardless of which floor I'm given the room.