Argentina was added as a nation placement (similar to Swiss vehicles in Germany right now) back before Israel was added as an independent tree.
That’s one single weapon, I agree it should not link a vehicle there, in the same way something using TOW missiles shouldn’t go to America by default. Had it been added today, I have a feeling the 2IP & 2C would have gone there given the connection, but the original TAM being in the German tree (and rightfully so) made sense and still does now, and having all the TAMs in one tree also makes sense.
Again, it’s more than just that. It’s Israeli radars on their aircraft (great example is the harrier they had with an Israeli radar, HMS, and Israeli AAMs), SPAA modernizations with Israeli radars, a lot of Israeli weaponry and Israeli FCS configuration for those weaponry, and much more. It’s not just the simple fact they use pythons and derby’s or spikes, it’s deeper than that.