It's all about the money man, nothing should be ruled out completely when it comes to football because their are some kind of offers that may be placed on your table that you will be unable to say no to, and I believe that real madrid are also in for the business, the only thing am quite skeptical about is if it's a logical choice for Liverpool, because mo Salah is still very good, and can still be properly utilized in the next two seasons or more, so why no tying him down at Liverpool by extending his contract further?
That's their own decisions to make anyway, but in the case of the possibilities of Rodrigo moving to Liverpool, nothing should be ruled out entirely because anything can happen in football.
And weird thing is, even though Rodrygo is a great player, and even though Liverpool would be willing to pay that much, he still won't be as good as Salah. Not because Salah is just such a great player, that too but not the reason, Salah got used to a system and a team and a star player at the same time.
You normally do not get many star players who play at the same team for many years and get used to it, there are many that moves teams and leagues. Rodrgyo is a great player, but for him to be like Salah, he needs 5+ years of playing with the same team, and hopefully even with the same manager. This offer however, shows that, keeping Salah isn't about money, if it was all about the money then they could have just paid Salah, instead of paying Rodrygo this much.