The 1928 revision was very extensive - perhaps the most radical U. S. prayer book revision until that of 1979. Some of the many changes from the previous 1892 book included dropping liturgies of rather outdated theology, such as the Visitation of Prisoners; the three baptism rites were combined into one; and several changes were made to the Communion service, including further deemphasis of the Decalogue, and rearrangement of the Lord's Prayer and the Prayer of Humble Access back to the position they had in the Prayer Book of 1549.
I gotta disagree here. The text of your post was taken verbatim from justus.anglican.org - an English Anglican website. I went and actually compared the '28 and '92 books, and I think their claim that the changes were extensive or radical is off the mark. Occasional services were deleted or changed (such as the visitation of prisoners) but the communion service and morning and evening prayer were altered only in rearranging things - the Decalogue remained intact and in place (I'm not sure what they mean by deemphasis unless it's that one rubric changed to allow the "short" Decalogue.)
I wondered what their motivation was in claiming that the 1928 revision was radical or extensive, until I found an editorial elsewhere on the site here saying that the consecration of gay bishops is really not such a big deal, that it all happened before over the issue of divorce and remarriage, and that this will all be forgotten and be nothing more than "yellowed letters in archives."
Which just sort of clarifies where they're coming from.