"Cheapens the struggle of" is not a statement about political structures, it is a statement about personal experiences. I don't think it is fruitful to reduce the experiential quality of living in an oppressive regime to some calculus of cheapness, wherein Having Supreme Court Judges counts as +$10.
I think the experiences of Black South Africans were a lot worse than those experienced by Palestinians and Arabs within Israel. I think if people redefine "apartheid" downwards to cover any regime that people don't like then it becomes a meaningless term.
If you posit that the West Bank is effectively annexed and that the Israeli government has no plans to ever quit it, then technically the West Bank is governed by an apartheid system.
I disagree that we are redefining apartheid.