I will agree and slightly disagree.
Neco Williams isn't trash. He's a 21 year old fullback, who likely should be starting for a pretty good EPL Club. He was very good in his time for Fulham, and by most accounts, they wanted to keep him. Liverpool would be happy to keep him, but he does not expect to beat out TAA for playing time anytime soon, so, a good price for the club and a good move makes sense.
It might be a bit of an overpayment, but not really when looking at some of the prices (and considering he's a full international). At the end of the day, the big figure at the top of the board is more than likely installments over a couple of seasons, and likely even some money based on staying up.
But you are hitting at something that is consistently missed in all of Liverpool's performance to become an effective football power. They've frequently sold very, very well, and have constantly found value in fringe guys. Some of the players they've sold have turned out to be poor for clubs they go to, but I don't know that I put that all on the player. Yet, clubs still lineup to pay it.
Gomez will likely get minutes there if it comes down to it. But I would also expect some of the time to go to Ramsay before long. The nice part is he can sit and watch for most of the early going. If TAA picks up a knock, Gomez would get minutes first.