[<1/1,000,000th%]

They’re calling it below the lower mantle. Even viscous rock that far down is not compressible. Any force would redirect upward. Definitely something going on down there.

[Cold Heat]

I am not really impressed by some idiot claiming a new discovery here...

There must be varied viscosities all along the post mantle area. These would be transitory in nature...as they heated. They may be more common where the plates enter.

I would think this is to be expected, and not discovered.

[Cold Heat]

They’re calling it below the lower mantle

The depth they cited is not deep enough to be below the lower mantle.