Liverpool agreed to sell Quansah for 35 Million Euros to Leverkusen, I don't know if this is a lose for Liverpool or not. His value is actually fair for 35 Million Euros because his performance isn't that good even he had been played for 2 years in Liverpool.
But, Quansah might able to improve and upgrade his level because he' still young.
Of course, Quansah still has the possibility to play at his top performance with another club. Maybe with Leverkusen, he can get that development. Liverpool has bought Florian Wirtz from Leverkusen for a high price, but in return, they also let their player go to Leverkusen.
There will be no loss if the season goes well for them.