The BGN transliterations were mistakenly removed from ICU (because of the CLDR2ICU tool). The principle is right (don't include draft=provisional items), but instead of removal we should have changed the draft status to contributed.
The quality is fine, and these are definitely in use — we are (painfully) finding this out in internal integration, and having to patch our version of ICU to include them from CLDR.
(We may need to modify the tests in ICU and/or tweak the newer BGN translits in CLDR.)
Move provisional to contributed.