>>712495191it's genuinely a dumb excuse, like just say "we weren't able to make eshop music" instead of speaking something so bullshit, especially with a problem that they had a solution to over a decade ago.
regarding your second sentence, I think they just composed whenever they could, since the theme didn't really update monthly. It was every few months.
The masterminds behind the designs behind these menus are working on other things unfortunately. The people who designed the wii u menu went on to make splatoon, and one of the lead devs on splatoon is working on the nso playtest thing known internally as rockstock, which is probably the last thing that reeks of wii u soul at nintendo.