The antisemitism is very much a real and systematic issue within Labour. It does predate Corbyn, but he has consistently failed to do anything about it and been dismissive of people who have been sounding the alarm.
Someone like Luciana Berger shouldn't by any right have joined Umunna's centrist vanity project, and almost certainly wouldn't have if her party hadn't treated her like an outcast.
In the inquiry, 0.08% of Labour members were found to have engaged in antisemitic behavior and ejected.
Obviously all anti-semitic behavior is objectionable and wrong, but are we really to believe that the general British public (or the conservative party for that matter) has
less anti-semitism than that and that this is an outrageous scandal?
Because of the way the anti-semitism scandal has been exaggerated by the media, Brits believe when asked by pollsters that something like 35% of labour members are anti-semitic, which is a gross overestimation.
Also, I have yet to find Corbyn or Labour's current leadership do or say anything that is genuinely anti-Semitic, and it seems to a (admittedly not terribly close) observer like its the same smear that goes in America, i.e., if you criticize Israel's government and you support increased autonomy / rights for Palestinians, that means you must of course hate Jews / be a self-hating Jew.