Basically to be on the safe side, ask at each place you intend to use them.
As the site you pointed out says, they may require a permit to use.
WorldNomads also cites it as a concern:
Any form of hobby that involves cameras, binoculars or telescopes may
well be misunderstood by military or police officials if practiced
anywhere near a government building, military site or airport. Of
course, by misunderstood I mean they may arrest you, confiscate your
equipment and wonder what it was you found so interesting about their
military base. So, leave the bird watching or plane spotting for
places where you’re less liable to look like you’re up to something
And the site crazy-travel says almost exactly the same thing:
Hobbies that involve cameras and binoculars, such as bird watching and
plane spotting, may be misunderstood - particularly near military
sites, government buildings and airports.
Long story short - it's better to ask at your hotel, and at the ticket office or information center for every place you intend to use them.
If you're concerned, there are the built-in binoculars at the top, although they cost US$3 to use - for 2.5 minutes.