It seems as if Victor's Camden plant issued this record right away on the third version of the Scroll label (“Orthophonic Recording” above the Nipper trademark and "For best results, use Victor Needles" to the left of the spindle hole, used Spring 1928 to Spring 1930), whereas the Oakland plant was still using up the second Scroll label style (Orthophonic Recording to the left of the spindle hole and the catalog number to the right side of the spindle hole, used Spring 1927 to Spring 1928).
Label dates per M. W. Sherman, Collector's Guide to Victor Records, 2nd ed., p. 93
In Joel Whitburn's book Pop Memories 1890-1954 of 1986, "Blue Yodel" was listed as a nationwide #2 hit in 1928, eleven weeks on the charts as of May 1928 and one of the biggest hits of the year. It was, however, not even released outside of the South at the time (no mention at all in the record lists in Talking Machine World, one source that Whitburn allegedly had used), and we can assume that almost nobody in New York, the musical center of the USA then, knew the record or the singer before the end of 1928.
But, as said several times before, Whitburn's Pop Memories were rather "Pop Fantasies". See this discussion again, where Boursin provided an unvaluable link to a review of Whitburn's book by media historian Tim Brooks.