I wouldn't say that's too outlandish. Archer and Adams are probably comparable. Certainly Ramsdale, Dibling and Fernandes are a cut above everyone else in that list. I expect they will all leave though.
Genuinely this is amazing business. To get that much for a player who has completely flopped is brilliant. It will be worth even more if the early money brought in allows us to keep one of our three jewels (Ramsdale, Fernandes or Dibling).