Why didn't Mizuno use this?
From his earlier paper..2017..
"Rub the surface with pure palladium. The palladium will adhere to the mesh.
Alternatively, the palladium can be plated onto the mesh (plating solution: Tanaka Inc., PDMO2LB).
This is the key step. In an industrial process, a similar material might be fabricated by some other method such as Nano-sintering."
I think Mizuno may have tried plating solutions but perhaps he found that it was easier to experiment with burnishing