I can't tell you the exact reason Inoue fights on a Tuesday but if he's fighting in Japan at Ariake Arena he seems to prefer to fight on Tuesday.

In some cases and countries a mid week fight can be due to clashes with other sports or events.

Doheny is 4-0 (3 KOs) in Japan, the 2nd of those being a KO1 over Inoue's friend and sparring partner Japhethlee Llamido. Everything is stacked against him but Doheny has some buzz around him in Japan off his recent form and he's a former champion. There have been worse stay busy opponents. Not to disparage Doheny but I expect Inoue to score a spectacular KO!