My 2013 Landcruiser has one and I’m pretty sure all US market 200-series did as well.
It is not intended to be changed, the rivets and lack of a separate part number make that clear.
And yes our airboxes are prone to fine dust bypassing the primary filter. I have seen evidence of this on my rig and it’s a well-known issue on the 1VD variants leading to turbo and piston ring issues. They seem to get it worse than the US rigs.. could be differences in the air box design.
Because of this I run K&N filter grease on the flange of my air filter and haven’t had the issue come up since.
I’d personally be shocked if Toyota intended the carbon filter to handle particulates, as that would be admitting their airbox design may be flawed.
Also the bit about reducing turbulence was my speculation, based on that method being used in other places. Thinking through it further it won’t do anything for that job that the primary air filter didn’t already do.
Do you also run a K&N filter?