If they have modest targets, then it may be achievable. Just because Ronaldo is playing in the Saudi Professional League, it doesn't mean that all the SPL players will start to showcase skills like him all of a sudden. The most immediate improvement will be a greater visibility for the Saudi Professional League.
I agree that just because ronaldo is playing in that league the other players have not become good players, but what will happen is that ronaldo himself will start not playing well due to the fact that he is playing with players who are not top level players, ronaldo's skills will reduce each season and as a result he will retire forgotten. the truth is hard but it needs to be faced head on, this league is not competitive, so ronaldo obviously won't be running a lot or making much effort, it will be as if he were playing at an amateur level, any coach or physical trainer knows very well that when an athlete is not competing at the highest level he does not have high level skills
This league has attracted a lot of fan interest after Ronaldo joined Al Nassr. With greater visibility, there will be greater interest from sponsors and TV broadcasters. Ultimately a part of the money will end up at grass roots development programs around the country.
All this people's interest in watching this deal will end in a few months and the reason is quite simple, nobody likes to watch games that don't have quality, what will remain will only be the bookmakers who may even be placing odds for the games of that league, but nobody will be doing as much publicity as they are currently doing, even if ronaldo is a good player after some time in that league without quality he will not even be with 30% with the same skills, that is ronaldo in that league will not be at the same level of players from europe