The 1888 LDS edition accidentally omitted the noun things, leaving only the demonstrative these. Of course, these things is clearly correct since these, used alone, allows the reader to interpret the demonstrative as referring to either people or to words, at least theoretically. The 1888 edition was never used as a copytext, so this typo was never transferred into any subsequent LDS edition (as if its oddity wouldn’t have been enough to prevent that).
Summary: Maintain in Alma 34:7 the occurrence of these things, the reading in the earliest textual sources.