That is such a huge price to ask for. He must have done that to sell him at a price not less than 150 million as you’ve predicted. This will also drive away the interest of some top clubs. I am sure he will consider this offer but not to a much reduced amount less than the 150 million. Although any club that is so much interested to sign him, 150 million won’t be an issue for them to buy him if they are fully prepared for it.
A fantastic price and I'm sure no team will be able to waste a large amount of money on a player, even Osimhen performance this season is not as impressive as last season so big teams will think as best as possible to recruit him. For Napoli, of course they set a higher price to be able to keep Osimhen from leaving to another team. He is still an important part of the Napoli squad this season even though his performance is not very good, but he can cause a lot of problems for the opposing defense.
Well, Chelsea is very interested in recruiting Osimhen, they even tried it in the last summer transfer window but it didn't work because Napoli asking price was quite high. Well, this is just speculation that is developing and I am sure that Napoli will try their best if they are really looking for a profit from selling Osimhen.