Yes, both volumes were released then.
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w893/15p.10"InsightontheScriptures"—ANewBibleEncyclopedia***"Insight
ontheScriptures"—ANewBibleEncyclopediaAT THE "Divine Justice" District Conventions of Jehovah’s Witnesses, announcement was made of the release of a new Bible encyclopedia entitled Insight on the Scriptures. This is a two-volume publication, with a total of 2,560 pages, all of it in clear, readable type. At present it is available only in English, but translation is already well under way in a number of other languages.InsightontheScriptures includes much of what was formerly in the book AidtoBibleUnderstanding and a great deal more. In what respects is it different? Scores of sections have been revised and updated. There are also many new articles as well as added features in InsightontheScriptures.