Why didn't Mizuno use this?
From his earlier paper..2017..
https://lenr-canr.org/acrobat/MizunoTpreprintob.pdf
"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