How do you get the DetonatioN FocusMe Icon?
It was sold in the League of Legends store. Riot's description in the client reads: “This icon was available for purchase in the store during the Worlds 2020 Event.”
Is the DetonatioN FocusMe Icon still available?
Probably not. Riot tied the DetonatioN FocusMe Icon to 2020 (store purchase), and it does not normally bring back past event rewards or bundles.
