I feel that I am contractually obligated to inform you that false flag attacks traditionally aren't carried out with the consent of the true bearers of the flag.
Is the situation fishy as all hell? Absolutely. Was Rheinland declaring war the right thing to do? Absolutely not, because...
[5:08:27 PM] Exodite (apparently): When GMG's installations go down, no more H-Fuel
[5:08:34 PM] Exodite (apparently): No more H-Fuel means no more capital fleet
[5:08:52 PM] Exodite (apparently): No more capital fleet means "welcome our Gallic overlords".
EDIT: Which has historical precedent, because GMG embargoed Liberty once forever ago and Liberty got crippled because of it.