eventqueuefix is pretty cool but doesn't work on Windows after the 2025-02-18 update.
eventqueuefix hooks CEventQueue::AddEvent() to do its magic. On Windows, the hook isn't always called because the function is also inlined inside CBaseEntityOutput::FireOutput().
This extension hooks CBaseEntityOutput::FireOutput() to make it call AddEvent() so it reaches eventqueuefix.
"Why not just hook FireOutput in eventqueuefix?":
- Because it's a little fucky to replicate in Sourcepawn and wouldn't work in x64 anyway, so an extension will be more future-proof.