Wow, that's an eye sore with all that bold, big text
If you don't believe that a son of Black Widow bred back to Black Widow's sister is an inbreeding, then we will just have to disagree.
FYI, it is really not even a matter of debate that breeding an aunt to a nephew is an inbreeding. It simply is.
Now, whether or not it's a "severe" inbreeding is a matter of opinion (I don't think it's too heavy of an inbreeding myself).
But, regardless of whether whatever you calculated it on is right at 22%, or whether our 42% calculation is correct, this is immaterial to the fact that an aunt/nephew breeding is an inbreeding.
Jack