Update, today and tonight I asked management about this sign:
Seems that the uninvited hordes were descending on the Lounge and the Platinums were complaining that the place was packed when they arrived and there was nowhere to sit. So, hence the sign.
The Concierge also told me that it is working at the moment and she has not had to enforce anything at all.
And so it goes.
A sign at the Concierge Lounge, Denver Marriott South, Lone Tree Colorado. Hope this is not a new policy
Message was edited by: Anadyr