2014 NEC 680.26 (B)(5): All metal fittings within or attached to the pool structure shall be bonded. Isolated parts that are not over 100 mm (4 in,) in any dimension and do not penetrate into the pool structure more than 25 mm (1 in.) shall not require bonding.
That is a model of clarity NOT.
This is the only place I know of where the NEC uses the term "pool structure." In 680.26 (B) (1) it uses the term "pool shell." Neither term is defined in the definitions section.
Earlier in 680.26 (B) the code talks about the perimeter of the pool. They don't use the same term here.
My view is that cover anchors that are placed in the deck or adjacent material do not require bonding. But cover anchors that exceed 4 inches in any dimension and penetrate the pool shell more than an inch do require bonding. Your local inspector may disagree.
What is really really important here is to make sure the deck, no matter what is is made of, is bonded to the pool shell and the water.