@Eskimo -- There you go again asking for my opinion by beating around the bush. Why not just ask me directly to chime in like many folks do?
"Executive lounge access, subject to availability"
If you listen to self-anointed "travel gurus", they will assure you that there is no "material difference" between HH Gold and HH Diamond elite benefits, except that folks keep reporting instances like this one, where a HH Gold is denied an upgrade to the exec floor and, with it, access to exec lounge, whereas HH Diamonds never face such a restriction. Their access to the exec lounge is not contingent on being upgraded to the exec floor. They get it regardless. Clearly, a huge or "material" difference in benefit...
For HH Golds "Executive lounge access, subject to availability" means exactly what it says, with the twist that each property has complete discretion on deciding when there is or there isn't availability... That is what the commenter encountered at Conrad Tokyo. The property decided that there was no availability of suites on the exec floor even if it was a Hilton Impresario booking. No exec floor upgrade, no exec lounge access for a HH Gold.
G'day