Well the point is, that the whole “support the existence of the country” is very vague. Do I disqualify if I think that the illegal settlers need to ge the fuck out of the Westbank? Of what if I would boycott products procuded in Israel? Does that count as not supporting the existence of the country?". Which borders of what year or which treaty are meant by this? Would Israel consisting of only half of Jerusalem still count?
I think in general this is more aimed at the idiots who sing the “from the river to the sea” and want to get rid of Israel. In the native form of those articles there is no word of “support” you just have to acknowledge Israel its right to exist and dont have to be a racist fuck. So I would say the bar to gain a german citizenship is pretty low ;)