[ByTheBook]

Warner Bros does not get all of the $363 million at the box office, the theatres takes their cut. For domestic gross it's said to be roughly 50/50 during a box office run, with the distributor (in this case WB) getting the most during the first week, and then the theatres get the most, for Foreign gross it's much less, with China only giving 20% of the box office to foreign distributors.

Also the $200 million production budget does not include promotion/advertising.

So it's very unlikely that Tenet made a profit at the box office, however there's streaming deals, physical media etc which can earn a pretty penny, particularly if something becomes a cult classic. Blade Runner and Starship Troopers were box office failures having has made lots of money afterwards.