if you look at the statistics:

so beyond the estimation of those statistics, that Brentford was able to beat quite a landslide 3-1.
but in terms of classification Liverpool is still above Brentford with 17 matches that have been done with 28 points, still 1 game remaining difference compared to Brenford.
Brentford goal
19" Ibrahima Konate
42" Yoane Wissa
84" Bryan Mbeumo
Liverpool goal
50" Alex Oxlade
Liverpool had fewer shorts on target than Brentford and they deserved this defeat.
Darwin Nunez missed a great opportunity to score a gold for Liverpool and he reminded us about Fernando Torres bad performance in Chelsea. The target of Liverpool in this season is not standing above Brentford. They must end it within top four if they don't want to fall more in Premier League next season.
Being in top four means a lot for any big club, from finance, chance to play in Champions League, has attraction to star players and can have successful deals in transfer market.