Why is this sign allowed to remain where it is?

Action 11K of Bayside City Council’s 2001 Black Rock - Beaumaris Foreshore Master Plan, unimplemented so far, gives as a Priority 1:

“Re-inforce and encourage public access to the area surrounding the BMYS compound and associated jetty.”

The notice above is on a presently unlocked gate across public foreshore land leased to Beaumaris Motor Yacht Squadron, that is required, as a condition of that lease, to be accessible to the public (on foot) at all times.

Defects of this sign, especially the sentence "These grounds ... are not for general public use" are:

• It is not on the exclusive area of the Squadron's lease, but is instead on an apparently gratuitously-erected gate that can be closed across a public thoroughfare at any time despite the lease requiring public access there at all times, and
  
  
• No sign clarifies the legal right of public access, leaving members of the public to perceive that they have no right to go through the gateway.

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