It is not that momo clo is making fun of Black people, It is that momo clo is making fun of Non-black people in North America who actually discriminate black people and pretending to be anti-racists only in surface ! Momo clo is showing people can actually enjoy blackface paitings/cosplay without causing racial conflicts in Japan who does not belong to the Western World.
If you truly are anti-racist, you can do it too ! Because black people can understand their intention/respect/context and wouldn't feel offended if you truly have nothing against Black people !
The message is "you ppl are hypocrite because you are always satisfied with only pointing out blakface to be racism but would never face with racism in your heart."
You know what they call themselves in the UK? British. Not African-british, just british. And they get angry if you call them African British since they see themselves as equal to the rest of the country, and you are truing to put them in a "special class"
You know what they call themselves in Mexico? Negros. (The literal translation of black). No one gets offended, and just as they laugh about gueros and morenos (white and brown skinned people) people laugh with them (Mexican people will laugh and make fun of just about everything so I don't know if it's a good example).
Again man... Not every country in the world have the hangups that the US have on race. Every country has its own culture and part of being educated is precisely recognizing that different cultures have different ways to assimilate and express stuff.
In Mexico is just as fine to dress up as a native, just as dressing up as a charro; you know that if you dress up as a native in the US you will get mobbed because of your insensitivity. In Some countries, death is a very solemn issue, while in others it's just a part of life and it's even mocked.
Seriously. Recognize your own culture limitations and stop trying to push other cultures to comply to your own.
This japanese group is making something for the japanese public, not the american public.
If you like eating food that give you gas, and you constantly fart around people, it's your problem. And all people can do about it its ignore you or get away from you. They can't force you to change your diet so they would be more comfortable. That would be the correct analogy for what you are doing.