Moroni’s statement in Mormon 9:32–34 pertains to the plates of Mormon and does not necessarily pertain to the small plates of Nephi from which we get the first 132 pages in our present Book of Mormon. Concerning the script of the plates of Mormon, Moroni says:
‘… we have written this record according to our knowledge, in the characters which are called among us the reformed Egyptian, being handed down and altered by us, according to our manner of speech.’
(Mormon 9:32.)
He seems to indicate in the following verse that the Nephites are still speaking a version of Hebrew, for he admits that ‘if our plates had been sufficiently large we should have written in Hebrew; but the Hebrew hath been altered by us also.’ (Mormon 9:33.).
(Daniel H. Ludlow, A Companion to Your Study of the Book of Mormon, p. 307)