This sounds great all of Lynas's problems solved"But the supply...

This sounds great all of Lynas's problems solved
"But the supply chain mandate for supply diversification due to ESG and national security must weigh heavily in what I am saying. That issue cannot come and go."

Simple truth is Government's pass mandates all the time. They do this when they see a problem and have no idea how to fix it. In which case they acknowledge to the people the problem with a mandate and do nothing because they do not know what to do. The tariffs do not take effect till 1/1/2026. Your Adamus chart shows a knee in chart at that time. Why would they put off something this long. Simply they want to announce and see what happens and have lots of time to change it if they think it is needed.

Here are some things for you to think about in the meantime.
Lynas in 2019 had 14% of the NdPrO market Today 8%. Chinas share of the NdPrO, Not all REE products is now over 90%,
Lynas and MCP/MP have never completed any projects on time and at capacity.

So do something for me explain what is meant by diversification IE 50% of magnets will have nothing sourced from China by a certain date.

I have no idea when this dream will happen but I doubt we will see 50% by 2040. That is way beyond my investment horizon. May happen sooner if war starts and we nuke China but I do not want or think that will happen.
The only way we diversify from ND Magnets made in China, is if US comes up with something better that is not based in China. The chance of this is much higher than eliminating Chineas Nd and not very good for Lynas.