As Riot has transitioned to the Riot ID system, information from deleted Riot accounts may still be retrievable through the Riot API.
Under the previous summoner name-based system, deleted accounts would have their summoner names changed to a format such as "Number + Del" or randomized numbers, making it impossible to search for the original summoner name. However, with the Riot ID system, the original ID is retained, and there is no way to determine via the API whether an account has been deleted.
Therefore, as long as the data remains accessible through the Riot API, match history may continue to appear on OP.GG.
Please note that, in accordance with our policy, we are unable to manually hide or delete such records.
The Riot Games API is the official interface that provides access to game data for titles such as League of Legends, VALORANT, and Teamfight Tactics.