Lol this take is ridiculous...
Europe's increase in production of military equipment and munitions is happening in real time, however, it takes a long period of time to go from where they were, with dismal production, to where they're going, which will be significant. In the meantime, the United States greatly ramped up production under the Biden Government, creating new jobs and expanding factories / creating new ones, in order to equip Ukraine, handle a surge in foreign orders and backfill U.S. inventories. The U.S. production is in place and many Ukrainian brigades have become skilled and adept at using Americans weapons. Furthermore, the U.S. simply has the mix of quality and quantity SURPLUS systems and munitions (Patriot, PAC 2/3 Missiles, AIM-120 Missiles, AIM-120 Missiles, IFVs, APCs, MRAPs, etc) that Europe does not have to spare.
Ukraine was given a $50 Billion usd loan earlier this year, which they literally cannot spend fast enough in European markets currently, because timelines for marquee item production is backed up due to Europe's current domestic demands. Ukraine could order hundreds of IFVs from Germany and Sweden for example, but they'd be looking at delivery timelines starting in the 2027 range. As for air defense systems and interceptors, Ukraine has purchased as many IRIS-T systems and interceptors as Germany can produce. France and Italy are sending every Aster Missile for SAMP/T that they can afford to send. Britain is sending hundreds of ASRAAM Missiles and 5000 Martlet Missiles over an extended period of time. Ukraine simply cannot spend the remainder of the $50 Billion in Europe or domestically, and receive weapons at the pace they need to make up for the attrition they're facing.
Furthermore, the EU has agreed on a 175 Billion usd fund to support loans for the purchase of weapons from Europe and close Allies. Ukraine has special access to that fund as well. They'd be insane not to approach the Americans about selling weapons to them using both pots of money currently available to them. Especially sophisticated weapons that have proven highly effective, of which only the Americans can supply at quantity and pace.