I don't understand what the link you shared is supposed to show? It summarizes what I mentioned in my post. Despite Russia's annexation of the Krim, Rheinmetall wanted to push through with the deal. if it would have gone Rheinmetall's way, Ukrainian soldiers would now fight against an army which has been heavily armed and trained by Rheinmetall.
They are also doing everything they can to deliver weapons to countries where weapon deliveries are restricted by founding subsidiaries e.g. in the Emirates.
They have no problems at all to deliver weapons to dictators, military regimes etc.
They try to circumvent restrictions either via subsidiaries or by putting pressure on the German government. Here for example an article how they were to sue the German Government over a Saudi arms embargo:
https://www.reuters.com/article/idUSKCN1PE0PH/
The idea that Rheinmetall would be primarily interested in keeping the world at peace and defend Western democracies is a bit naive. All they care about are profits, and if those are generated by delivering weapons to the worst of the worst, they'll do everything they can to make it happen.