Unless you have a reputable source, I don't buy it. I've never heard of such a thing. It wouldn't be easily enforceable either.Someone can correct me if I’m wrong, but OLC has no choice. I’m not saying they don’t want to, granted their never ending expansions & new offerings. However I believe per their licensing agreement with Disney, they have to maintain the parks to a certain standard, and from what I recall being said on here, it is the standard that Disney has for their parks at the time Tokyo Disney was built.
TDR opened 40 years ago. Few to no high level TWDC execs still there today were around back then. And they certainly don't care about park standards. The ones who did know and care are long gone or dead. No one is going to try to impose standards on Tokyo that they themselves long since abandoned and likely wouldn't even be able to properly quantify and make threats over. Just for one example, I doubt there are any board members (and probably an exceedingly tiny number of park managers, if any) who are aware of the proactive "replace lightbulbs that have reached 80% life expectancy" policy that was still in effect around that time. Something that was a written standard once adhered to, but hasn't been for a very very long time.
One aspect that likely aids in Tokyo's park maintenance to some degree is that they still have ample corporate sponsorships compared to the US parks. Though that isn't the full story as there are still a few sponsored rides left in America that are in just as bad of a shape as the sponsored stuff. There's also a variability of maintenance standards between different TWDC-owned parks as well. Cali's standards have dipped in recent years, but it's still far better than WDW. In recent years, Paris' standards also improved drastically during the 20th anniversary cleanup and have reportedly yet to decline much if at all since. Friends have said it's currently maintained better than either of the US parks.
While this isn't the case for every single Japanese company in existence, there are also significant cultural factors at play. There's on average a much greater drive for perfectionism in Japanese society than there is in America. Self improvement, dedication etc.