More often than not, the VIP is guided to the VIP Lounge with an (implied?) message : we will call you when the flight is departing.
In this case maybe... the blokes sdvised him "your flight is departing now"... or the guy who was to inform him had to do something else etc...
Mostly this is the Airport or the Commercial staff who does this .
Not in the call of duty but beyond.. and then you have a SNAFU.
Also the stooges of the VIP also are over sensitive to this than the VIPs themselves.
Something of image to be projected....
Flight/Cabin Crew not at fault... just the last line of defence.. Capt asked to close doors, hurry up etc...
Now ready for the barrage...