He got fired for refusing a 3billion€ Ukraine aid package and argued for sending Taurus instead, which also obviously would cost money. Taurus costs over a million per missile and it needs to be integrated into some aircraft Ukraine actually uses. So we are talking some serious money either way, which he refused to release. Also in the past he wanted to not send German money to Ukraine, but pay aid from the frozen Russian assets.
The main reason he got kicked out was refusing to take on debt and instead cut social spending, while the German economy has some serious problems and there is a massive war in Europe.
No, he wasn’t fired for a single dispute but for everything he did and didn’t do the past 3. A single argument also wasn’t the last straw here. That was Trump. That the article tries to paint Lindner as some kind of hero is as unsurprising as it is outrageous.
But of course the international press would make it about something multinational, because that’s the only type of politics they know about most nations.
Which is to say that you should probably read up on German national politics if you want to know what’s happening within the largest economy in Europe.