Yay, back to the Biden strategy. Worked so well before. Harris would be doing this had she won, it's like you get the same crap regardless.
The $50M document seems to be authorization by State to US defense companies to sell various defense items to Ukraine. It is not the US sending arms or money, as best can be understood in the document. The money for the buy is not mentioned. It could be EU money. It can be from anywhere and Lockheed et al are authorized to take that money in return for shipping . . . not so much arms but apparently services.
This does not at all read like shipping from US inventory.