Take a look here, e.g. the paragraphs 1080i Disc Playback and SD playback. It mentions jaggedness as well.
https://www.avforums.com/reviews/son...yer-review.54/
If it's true it detects pattern cadences, means it does not even (or not only) rely on flag reading. No idea what happens when there is a conflict between the flags and the player's cadence detection.
Or ask SONY what magic they applied ;-)
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By the way, I tried an encode with bilinear scaling instead of Lanczos and I didn't see a difference on my BD player.
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About scaling artefacts and moiré:
http://www.glennchan.info/broadcast-...-artifacts.htm
In your example the jaggies become gradually annoying (viewed on PC) when I downscale (and upscale on the fly for viewing on PC monitor) the 1080 IVTC'd source to lower than about 640 vertically. In your case the downscaled active picture is 360 vertical only (1080->360).