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They were released in Europe earlier than in the U.S. which might explain it although the U.S. sets had different numbers .
The release date matched Bricklink until very recently, but Bricklink has changed.
That guide is just riddled with errors. They supposedly used the LEGO Archives info for putting their book together... mistake #2. I have had many dealings with the LEGO Archives and Collections folks over the years in putting together my Unofficial Sets/Parts Collectors Guide (computer desktop guide)... and while they are really nice people... I have had to discard at least 20% of all the info they have ever given me... because I have found proof to the contrary on LEGO set information.
Just look at pages 599-600 (LEGO Collectors Guide 2nd Edition) for 2004 Harry Potter sets 4750-4757. The guide says these 8 sets were only sold in Europe. But if you Google each of these 8 sets... you will find North American boxed versions (English/French/Spanish with parts counts) exist for each of these sets.
That guide also doesn't show the 310/1310 Esso Service Station (1956-66)... nor the continental European 810 Town Plan set (1961-67)... I can find at least 100 other errors in it.
My own 2012 version of my collectors guide shows all years as 1979 for the first space sets... but the current version (coming out by the end of the year)... does show corrections, with some USA sets as 1978...
The early 1101-1128 Service Packs have a copyright date of 1977. But the actual packs themselves didn't get into production until 1980. From 1977-79 TLG sold these packs as loose parts put into plain baggies by the retailers, under weird numbering systems (1-28 in Germany, Sp.1- Sp.28 in Italy, Britain and Australia, and S.1-S.28 in the Netherlands).
Even LEGO catalog can be misleading. The LEGO catalogs of 1962 show no LEGO wheels. But the (1st year) 1962 introduced Australia catalog of March of that year does show them as newly introduced.
The Bricklink database shows the dates for these sets matched Brickset until early 2009 (shortly after the "Official" Lego Collectors Guide came out)...
So it's Bricklink that's closely following the guide in this case. I guess Brickset is going off the boxes which all say 1978.