"HOLLOWTECH" is registered as Shimano TRADEMARK
"2-piece crankset" is NOT registered as Shimano trademark, and it is used by other companies:
22mm axle "2-piece crankset" from Haro -
https://jrbicycles.com/products/prem...piece-crankset
24mm axle "2-piece crankset" from Box -
https://boxcomponents.com/products/b...35349237235879
This is why they don't advertise "2-piece crankset" on bb box
But, you can still find "2-piece crankset" label on bb tools: