Becuause of the oversight of not reporting the 5th foul on the player, wouldn't it be considered an administrative technical against that team's scorebook?
Being that I've had training for both scorebook & scoreboard/timer, I've learned from doing the number of games I've done to be in constant communication between the books & the scoreboard to make sure the books match the board.
My reasoning for stating that the people need to be trained better is that I've seen too many instances happen where the person doing the scorebook is not reporting the game properly, compared to the scoreboard, & vice versa.