My conspiracy theory is that it's a sneaky World War 2 reference by someone that went unnoticed by higher-up chess.com developers. This wouldn't surprise me with all the oversites on this site as highlighted by the many other forum posts. You can take your own guess at the meaning behind America being white and Japan being black.
Maybe if chess.com actually paid their own moderators there would be more effort to smoothing out these kinks
I think that it's just two people who named their accounts White and Black, and because they're actually real players, what is supposed to be placeholder text until you add an account to link to white and black is already a link to @White and @Black
Staff are aware of this and have a ticket to correct, though it probably won't be fixed for a while.
It's the same for the Dutch version, where Zwart (black) and Wit (white) are linked to two user profiles (one Dutch, and one USA), where the Dutch guy has 21 matches (2017 being the most recent one) and the American guy has 0 and has last logged on in 2008.
So I think it's just a strange quirk in the coding of the platform where people who by accident or on purpose have chosen the member name that represents either Black or White in a language supported by chess.com, get linked to this analysis function
If you go to www.chess.com/analysis on PC and click 'make moves' it will link both a USA and JAP member account under the 'starting position' section. Clicking on their names will take you to their /member account URLs.
This link seems to have resulted in both accounts gaining thousands of views, the member account of 'Black' (JAP) especially with 43,000 views as of this post.
Interesting such a feature exists to highlight two lucky (or unlucky) member accounts. They're both active players, with White (USA) having 1400 games and Black (JAP) having 850 games.