The David Hayter voice was actually derived from EVO staffer and longtime Tekken fan/commentator Markman23’s Twitch stream: he had hired Hayter to voice his stream notifications.
Some of these appear in both the venue and on Twitch, but others are only seen by the Twitch viewership.
Players, on the other hand, drink those leaks up like a thirsty traveler at the only desert oasis for miles.