Sorry, but you're just wrong. The only reasonable interpretation finds that the regulations overlap such that member states can never execute without violating one or another regulation. Observe:
1) It requires member states to prove that additional evidence, true or false, could not arise to "cast doubt on the guilt of the defendant for any charge which could carry a capital sentence". This goes beyond even the standard of "guilt beyond a reasonable doubt", a standard not mandated for any court under extant World Assembly legislation. By requiring member states to demonstrate proof of guilt beyond any doubt, this clause alone fully prohibits capital punishment. The nature of reality always leaves room for doubt in all things, even if incredibly remote.
2) The eighth clause, in conjunction with an element of the fifth clause, once again fully bans capital punishment. The fifth clause requires member states to, following a guilty verdict at trial, grant the defense six months to review evidence, and grant the Capital Cases division another six months after that for the same reason, before carrying out any execution. However, the eighth clause also provides that trial certification by the Capital Cases division expires after one year, and that after such expiration member states may not perform capital punishment upon the convicted criminal.
3) The same clause also states that member states may not execute any convicted criminals that have not "exhausted all available appeals". This restriction once again effectively bans capital punishment, as it permits convicted criminals to simply not pursue an appellate verdict and thereby avoid execution indefinitely.
Not to mention the explicit ban on capital punishment in < 1 million pop nations, the ban on extradition to states that might exercise capital punishment on the extradited criminal, and the ban on exercising capital punishment upon rapists, murderers, traitors, and serial criminals.