I don't see any reason why Arsenal will agree to pay that hefty fee for Napoli's striker Osimhen,who hasn't played in the English premier league,and we don't know whether he will get their to be a flop or not.And to me,he is not worth that kind of amount being placed on him,he is just over hyped,I don't see any extraordinary thing that he does much on the field.Napoli have to reduce his price to either 70 or 80 million pounds,else he will still end up staying at that club.They should know that England is a tough place,and since he hasn't played there,they won't know whether he would do well there or not,so it's either they reduce the price or he stays at the club.
80 million pounds is a good price for him because if Napoli decided to increase it more it may likely take more longer time to see a buyer because one of things most clubs normally consider is that with such amounts of money they could easily use it to get more smaller players from the Academy and with time they will surely improve because that's one of the things Arsenal normally do, most of there young players that's currently doing very well now started the same way and sometimes that's actually even one of the best strategy buying some smaller players from the Academy and converting them to a better players and selling them on a higher price.
Though Osimhen is a very bright player that would really impact positively on the Arsenal team if giving the opportunity to join them, but sometimes the reason why clubs put there players on a very higher price is simply because they are not ready for the player to leave the team, but whichever way if a club really want hhim they will surely come for him no matter the price tag.