Not necessarily. Giuliani has stated that gun control is a state and local concern. In the decision at issue, the D.C. Circuit Court of Appeals stated in Footnote 13 that has not decided and has no reason to decide whther the 2nd Amendment protects citizens from state action to restrict or limit firearm protection, and that the SCOTUS has yet to rule whether the 2nd Amendment applies to the states by virtue of the 14th Amendment.
Giuliani's statements along these lines are nothing more than a pathetic attempt to cover up his track record when he was mayor of New York. Back then, he specifically DID NOT view gun control as a "state and local concern" -- as evidenced by his numerous calls for the Federal government to enact Federal gun control laws similar to New York's (plus his abuse of the Federal court system in filing frivolous lawsuits against gun manufacturers in other jurisdictions).