One thing to consider is that I don't think they're necessarily trying to tap into the international market. A lot of the press releases have made reference to trying to build a theme park to appeal to the local market in Saudi Arabia.
As for the human rights issues with Saudi Arabia as a country, it is undoubtedly a tough one. It really is up to the individual to decide whether they feel that they can look past Saudi Arabia's human rights issues.
However, what I would say is that I think it's very hard to be a truly ethical traveller and avoid visiting countries that have committed any kind of human rights infraction. If you rule out anywhere in the world that has ever done something slightly shady in terms of human rights, you're ruling out a surprising proportion of the world.
Now for clarity, I'm not saying for a single second that I agree with what Saudi Arabia does or that I agree with the draconian laws they impose upon women, LGBT+ people etc. However, they are far from the only country on Earth that has an arguably tainted human rights record, and plenty of other countries committing arguable human rights infractions or doing things that are ethically questionable have enthusiasts flocking to them without a moment's hesitation.
The UAE has laws discriminating against women and LGBT+ people, yet plenty of enthusiasts go there without a moment's hesitation. China are run by an authoritarian government who impose wide-ranging restrictions on their citizens' lives and have previously resorted to tactics such as barricading people inside their homes during COVID and invading Hong Kong, yet plenty of enthusiasts still visit China without flinching. Even the USA has arguably done ethically questionable things. Large parts of the country recently outlawed abortion following the overturning of Roe v Wade, its lax gun laws are an ever-contentious issue, and around 50% of states still have the death penalty. Yet you don't see any enthusiasts questioning whether they want to go to the USA or any of these countries.
Now as I say, I'm not saying that what these countries do is necessarily comparable to what Saudi Arabia do, and I'm not excusing or agreeing with what goes on in Saudi Arabia for a second. However, I think being a truly ethical traveller is nigh-on impossible. With this in mind, I would politely play devil's advocate and ask; where do you draw the line? What level of human rights violations are people willing to accept?