Dave,
The 'disputed' bit refers to the fact that it is disputed that what Naz Shah said and did was antisemitic.

Disputed by who Dave?
Just you three.

" Corbyn's aides defended Shah, saying the comments were antisemitic but the MP had "shocked herself," and did not mean what she said."

She herself admits it was anti-Semitic.
Why should anyone care or take seriously that you three think it was not?!!