Now ignoring two references that clarify the degree to which trans people were, or were not, targeted by the Nazis for being trans.
And indeed some trans people may well not have felt able to adopt a "cis" persona even for self preservation.
Izzard, however, has already proved willing to adopt such a persona not just for self preservation but simply for lucrative work.
It's really weird logic for you to ignore that specific fact about the specific person the tweet was by, and the specific fact in the linked sources that people with the specific attributes which Izzard possesses, attributes which Lineham specifically referred to, were not treated like the actual victims of the Holocaust, in order to appropriate the wider suffering of a different group of people in service of your desire to slur people like Duffield and Lineham because you have a political beef with them.
Duffield and Lineham are not denying the persecution of gay and transvestite men. They are denying Izzard's appropriation of that suffering to bolster his public image.