This is, unfortunately, true:
Former World Cup official Graham Poll went as far as to say that it’s an introduction that every official wants, but will never get, back in January.
“Unfortunately, the International Football Association Board, the body that determines the Laws of the Game, are unlikely ever to afford referees sin-binning as a tool,”.
"Football doesn’t like change, and the time it’s taken to get so close to introducing video technology proves that."