Here's how I know if/when someone is antisemitic when it comes to Eurovision.
If they say "I want Israel removed from Eurovision until the blockade is removed"- that's not antisemitic.
If they say "I want Israel removed until there is a new ceasefire." - that is not necessarily antisemitic.
If they say "I want Israel removed from the contest next year." - that is antisemitic, because no one knows what the state of the war will be next year.
If they say "I want those bloodthirsty Zionists out of Eurovision." then that's just pure hate speech.