According to wikipedia, 16:9 SD video formats are also valid BD-Video formats
https://en.wikipedia.org/wiki/Blu-ray#Video

SD   720 × 480 29.97i     4:3 or 16:9[d] (anamorhic)
     720 × 576 25i        4:3 or 16:9[d]

The Create BD Format contains 720 x 576/ 25i/p and 720 x 480/ 29.97i/p

Please verify if this these are SD 4:3 only?
The wikipedia table lists only SD interlaced as valid SD BD-Video format

If so, SD 16:9 interlaced are missing, while SD progressive are invalid?

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