I'm not sure how else to say the same thing to you. You don't see to fully understand how taxes work (which is totally fine) and think that "something needs to be changed" but you can't articulate what.and it says this-
Experts say that the company decided to "cut its losses" rather than release a film that did not align with the DC and HBO Max brand, while also giving itself a hefty tax write-off.
So yes or no, did Warner benefit from shutting down the movie with regard to taxes.
All the News stories say yes, some guy on a forum says no.
Now taxes are not my expertise, statistics and trends are what my job requires me to go when I have to do my reports.
Is there a lower taxable income (which results in a tax benefit) as a result of not releasing the film/television series noted above? The answer is dependent on which time period you are looking at. If you are talking about the single year, then yes as they would have only recognized a portion of the cost of the film/show in that year. If you are talking about over time, then the answer is no as they would have recognized the rest of the expense in following periods thereby reducing taxes for those years. They didn't receive any extra tax benefit for writing off the content above the amounts they already spent.
You seem to think that they somehow got credit on their taxes for lost revenue and that is not true. However, they could have mitigated some of those losses with revenue and therefore potentially increased their taxable income (but only if the revenues were more than the cost to release/air).