I was just surprised as you are when I read what he said that they should sigh Garnacho and Anthony as Jonathan Tah's replacement. Replacing a Midfielder with an attacker is not ideal at all, it would definitely affect the team so if Tah is leaving they should get another midfielder to replace him and not attackers. It'd be difficult for Bayer Leverkusen to retain Wirtz now especially since Jonathan Tah and Xabi Alonso are leaving he would have excuse to leave without feeling bad about it.
He can't stay at the team forever and the team should know that a player of his qualities would attract interest from bigger clubs. Liverpool is not a bad team to join.
In my opinion, this is a long debate and a debate that we can never conclude because every viewer and every fan has a different way of thinking. Now, in this same discussion, some people are saying that there is no problem with the midfielder leaving because there are other players in the team who can be replaced, but the thinking of some people is completely against it. But if you look at it, I am not concluding any result, but it is a simple matter that a player has a job to do. If he does it, then that job looks good. For example, the players who are being named as those who will replace the midfielder are basically attackers, and if you change their place, it is obvious that your game and your performance will make a difference. So, those who are talking about the attackers not being deployed there, my personal opinion is with those people that by doing so, the team's Performance will also be affected.