Wii 2020 Wbfs High Quality: Just Dance

In January 2021, a user named "CRT_Ritual" posted a deep analysis on Reddit. Using a hex editor, they found a hidden string in the main.dol executable:

While a standard ISO file is a literal 1:1 copy of everything on a disc, it often results in large, unwieldy file sizes. Choosing a high-quality WBFS format Just Dance Wii 2020 Wbfs High Quality

Why did Just Dance 2020 release for the Wii, but not the Wii U? In January 2021, a user named "CRT_Ritual" posted