It even mentions: " However, many last names were altered slightly due to the disparity between English and other languages in the pronunciation of certain letters of the alphabet"
Unfortunately their source [34] is a link that does not exist anymore at that URL
I can certainly see a phonetic name being created for a Cyrillic-using person. The others -- I suppose it was a case of "accented characters are hard" so they got dropped.
It even mentions: " However, many last names were altered slightly due to the disparity between English and other languages in the pronunciation of certain letters of the alphabet"
Unfortunately their source [34] is a link that does not exist anymore at that URL