Cassette isn’t just a name for the type of tape. It means plastic enclosure. The plastic above the chain on bikes is still called a cassette to this day.

Cassette tapes are called that because cassette is a descriptor. Technically, VHS tapes were cassette tapes, too (Video Cassette Recorder, anyone?). ...and…

Shouldn’t the headline and byline be reversed? Nintendo is actively pushing for more diversity, which is positive news. If someone reads only the headline, (as many people do these days) they would think that it is negative news about a mega-corp that won’t change its sexist ways.

No, only use fewer if it’s countable. For instance, you would use “fewer cars,” but “less traffic.” Percentages are funny because you can count the numbers in the percentage, but percentage is really an abstract representing something countable, like traffic.