Sounds good to me!
I know that military and paramilitary forces of other nations (who are Geneva signatories) have used frangible munitions for their counterterrorist forces for a long time. I assumed that this was because non-uniformed combatants were not afforded Geneva protections, but the info you present may be the justification. IIRC, the Blitz Action Trauma (BAT) was designed for GSG9...it had a plastic tip that allowed smooth feeding in weapons designed for FMJ ammo, but the tip merely covered a gaping hollow-point...
Those look neat. I use CorBon Pow’r Ball for carry ammo which seems about the same in concept. I do not think that Geneva Convention rules apply to GSG9, SWAT teams or other non-military organizations doing hostage rescue type stuff. GSG9 (Grenzschutzgruppe9)is part of the German Border Patrol (Grenzschutz) which is part of the German federal police, not the Army (Heer). The pictured ammo looks like it would be ideal for quickly dropping terrorists and minnimizing over penetration in airplanes and other crowded places that an anti-terrorist force may have to operate in.