The Seria A remained competitive as other league, the same thing the Saudi league is working on. Saudi Arabia was making huge offers for the Argentine, while Inter Milan hoped fervently that he would stay at the club. Given that Inter Milan vice-chairman Javier Zanetti has spoken about the actions circulating regarding naming Lautaro Martnez as the new captain for the upcoming season. Inter Milan is on the danger of losing one of the club's most crucial frontline players, Lautaro Martinez, who has yet to make a choice. I believe he would like to stay at Inter Milan.
If it is true that Inter Milan have to sell Lauro Martinez to the Saudi Pro League, it means that the club's finances are not doing well. Last season by being a finalist in the Champions League actually helped Inter financially a lot, but this situation was not only experienced by Inter all Serie A clubs were struggling to get out of this zone.
Letting go of star players at the club is the most immediate step that can be taken to keep finances stable, and recruiting other potential players will save money on transfer fees and players' annual salaries. However the possibility that Martinez will stay at Inter is still quite large, because Inzaghi will give him more responsibility as team captain to replace Samir Handanovic role.
Your analysis is good, because what else is the reason when they sell one of their best players if they are still financially healthy, and especially it is a team from Arabia that we know they will definitely be ready to pour a lot of money, it is also one that might justify your analysis.
On the other hand, would Inter Milan want to lose one of their most valuable players? I don't think they need to do that if their finances are still sufficient. They should look at Barcelona, they could have sold Frenkie de Jong at a high price to improve their situation, but they didn't because of the player's huge potential.