This is nonsense. Israel is both a buyer of EU made weapons & equipment & a supplier to EU countries.
For example, Italy operates Israeli AEW systems, fitted to US business jets in Israel, & is buying more. Israel has Italian jet trainers & ground-based systems which work with them. The Israeli navy has German submarines & corvettes, with Italian guns. Germany is buying Israeli radars, e.g. for warships, & MRLS & ATGMs. In 2019-23 30% of Israel's military equipment imports were from Germany. Denmark is buying Israeli 155mm SP guns & MRLs, & Israeli firms are competing to supply air defence systems. A few years ago Lithuania was complaining about Israel - because weapons Lithuania had ordered from Israel weren't being delivered on time. It was settled after a while, & Lithuania's now buying more. Estonia has Israeli ATGMs, anti-ship missiles & UAVs. Latvia has ATGMs (20 EU countries have bought Spike). Sweden - UAVs.
And so on . . . .
EU -> Israel
Multiple key nations imposing arms embargos or obstacles for trade.
2019-2023 were peak years because of the delivery of Sa'ar 6 ships and submarines. Germany was uniquely positioned to supply such vessels as one of only few builders in those categories, and besides Germany is the only country in Europe that's actually an ally to Israel and has the capacity to be useful.
Other friendly nations lack the defense industry.
Defense imports from the rest of Europe are minimal because they're not dependable. They're cut off immediately when there's war, chief among them the UK which sees it as a national sport.
Israel -> EU
Israel's MIC is focused on local maintenance capability and low rate production of critical items. It's able to produce its own ammo for example, but at least not at all sufficient to support an ongoing war effort.
Due to Israel's frequent wars, its MIC would essentially be restocking in between, and would be of little use to Europe in terms of total work done.
What it can contribute is reference designs to facilitate local production in Europe. That much is assured no matter how hostile these nations become.
That is not what makes one a strategic arms supplier. Far from it.
This brings me back to my point that the US is irreplaceable for Europe, no matter how hard they try. It could be replaceable, had Europe not abandoned security these past 30 years.