Unfortunately we don't have experience with this type of hardware, and this degree of tree structural reinforcement is beyond our expertise (as we at HGIC are not trained arborists). We suggest getting a second opinion (or even third, if low-cost) from another certified arborist or licensed tree expert to see if they agree with the need for reinforcement. Codominant leaders, which the maple pictured does appear to have, can be quite common among tree branching flaws, and these narrow attachment points do pose a risk for splitting in stormy weather due to the included bark that forms between the two halves, which does compromise its structural integrity.

Miri