It is though. You can't look back at historical transfers because it doesn't factor in the inflation in transfers. Perez £30m, Wan Bissaka £50m, Kalvin Phillips £25m, Lukaku £70m that's the current market rate. It doesn't matter how much bale cost or ronaldo cost or shearer cost or lentini cost. This is the current market where a player lyon bought for €8m is worth £65m when he moves to the premier league. £50m is the price for an average player, £80m+ is the price for a good player and £200m+ is the price for a world class player. Athletico just bought some an 18 year old with potential for €126m, that's the market.
Zaha is worth £80m in today's market.