Even if, for the sake of the discussion, I were to grant you that the park is intentionally misleading consumers regarding the reason for the closure (I'm not convinced of that for the record), I still wouldn't think it consequencial. Obviously if the park is lying to guests I would be opposed to that but, on the flip side of that coin, if the lie doesn't serve to change the guest expectation or experience in any way (read: the ride is announced as closed for x time), I just don't think it's an enormous deal. Bad behavior? Yes. Substantively problematic? No.
This is part of the reason parks often don't give reasons, for the record. The reason for a closure frequently changes and evolves and if a park claims one reason and then that reason changes, they're now on the hook for providing that new reason as well—and that can sometimes be a pretty big ask depending on what that reason is.
Sure, maybe your supply chain thing is true now, but if they post that info to the website, the part arrives, is installed, and testing begins only to have the lift cable explode three days in, the park certainly does not want to have to communicate that to guests. Even just a notice shifting from "supply chain delays" to "unexpected maintenance requirements" becomes a negative news item for the park. Why would they volunteer for that when, again, the reason doesn't make any difference to guests as long as the outcome is the same, the closure is communicated, and the estimated return window is kept up to date.