This is nonsense

I recognized it immediately when it claimed the J-20 only supercruises at 1.3 mach

Anyone with a engineering degree understands that fighter jets carry a significant amount of fuel.

The J-20 in particular carries 26,000 lbs of fuel while the F-22 carries 18,000 lbs of fuel

Now here is where the disinformation comes in he cites the

F-22 as mach 1.8 supercruise J-20 as mach 1.3 supercruise

But the actual numbers are

F-22 is mach 1.5 at full fuel load

F-22 is mach 1.82 only when it is nearly empty

The J-20 is mach 1.3 at full fuel load

mach 1.8 only when it is nearly empty

Choosing the J-20 number at full fuel load, and choosing the F-22 supercruise speed when it is nearly empty is deliberate disinformation.

Your substack has lost all credibility.