If you know that movie length is 5354 seconds and the file size is 1,37 GB
You can calculate: 1436549 kB / 5354 seconds = 268.3 kBps x 8 => 2146 kbps
Germania
But looking at the analysis window, you don't know that. You can tell that one of the bitrate or the file size is wrong, you can't tell which. But internally, as shown above, StreamFab knew. And that's exactly what StreamFab ought to have done, report the much lower bitrate as what would be downloaded. That's been my point all along: tell me what you're going to download.
btw: If ~2100 kbps (result 2190) HEVC for a black-and-white movie (!)
is on your “do-not-download list”, you should cancel HBO Max
Germania
For a movie from from 1930's or earlier, when the film gauge was small and the grain was more like beach sand, sure. Of course, offering such a film at 1920x1038 would be silly, too. For a David Lynch masterpiece made in 1977 with state-of-the-art equipment (for the time) and B&W being a conscious choice, no.
And you ignore that HBO Max has a lot of modern films that StreamFab will retrieve at very high bitrates - for a streaming service - indeed. It used to be Amazon was the clear winner there. Not any more. Just as well, given the grief they've been giving out recently.