There’s a lot of misunderstanding around this stuff. Technically all you need for a bomb is the ability to go prompt critical on demand which you can do at surprisingly low enrichment levels. What’s a useful weapons grade enrichment to you has a lot to do with your delivery systems not some universal constant. If you’re looking to fit something in a WWII bomber or early generation ICBM that imposes specific limitations.
Being able to produce weapons grade uranium != producing weapons grade uranium. It's not that complicated.
And yes, in an alternative universe where delivery systems also just appear out of nowhere, you could sprinkle a million tons of 1% uranium over a city.
It’s not about delivery systems just appearing, the logistics of tossing around nuclear weapons in the Middle East using modern technology allows for a vastly larger bombs without significant issues.
Little boy was a logistical issue at the time but only 4,400 kg. You can buy a used A380 for a few 10’s of millions. Convert that to a drone is fairly cheap, and you end up with a vastly cheaper system than the cost of producing a nuclear bomb.
Obviously a subsonic aircraft isn’t ideal, but historic ICBM’s ended up being designed for multiple bombs that’s a lot of leeway if you use the same system to deliver a single bomb. What the US considered weapons grade in the 40’s through the Cold War is based on assumptions that simply don’t apply here.
Saying it’s not weapons grade only means you haven’t finished or intend to use something else for the initial stage.