It's just a random ill-thought out excuse. Because they're Liverpool and everything simply has to mean more. At the risk of sounding even more callous, if he'd played for Spurs or Brighton he'd barely get a mention now. Yes of course the tragic loss will have affected the players who were his mate and they’ll always miss him, but it makes no sense to only use it as a reason after they've lost a game. The half a billion quid of new players didn't know him (probably not on a personal level anyway), and it certainly didn't affect them when they won the first 5 games of the season, or when they've won 3 out of 4 games in the Champions League despite their PL slump. But Liverpool always have to remind everybody that they're the only ones who suffer from tragedies.