This event is triggered from CHalfLifeMultiplay::CheckWinConditions() and it happens when the matches is not started yet (m_bMatchStarted offset) and there are spawnable CT/T (m_iNumSpawnableTerrorist/m_iNumSpawnableCT offsets).
So to block the event, you can hook this function, checking these offsets and supercede.
In
InfiniteRound v2, there is a cvar which lets you to choose whether you want to block such event. You can grab the code from there.
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