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. 73% ball possession and 16 shots don't mean anything when they could not shot on target.
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.
Yes, Liverpool certainly really hope to be in the top 4 at the end of this season, because that position greatly affects the course of everything that will be carried out, from sponsors and also player transfers which will increase performance in the following season.
currently in the 6th position of course to be able to achieve what you want you have to be able to shift Newcastle and Tottenham, while MU is likely to be tough.
with the remaining matches available, Liverpool must use each match as well as possible to gain points.