Change the first sentence to be:
"The address that issued a property can replace or append that property. Attempts by other addresses are invalid."

Change:
A property which has been replaced by a new property with the number of properties set to zero may be used to indicate that the issuer has abandoned that property entirely. 
To:
Set the number of properties to zero with Property Type 65 or 66 to indicate that the issuer is abandoning that property entirely.