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It's a common misconception.  They are not quite so long being closer to the length you would find on a Sumatra.  They are quite beautiful still and very friendly birds, even the ones I do not handle much will still come up for a bite to eat or walk amongst my feet when I'm out in the yard.
There is one line of cubalaya that does have a lengthy tail, but you will not find them at a hatchery.  You'd have to locate the breeders that were lucky enough to obtain them.  Craig Russell, Charles Everett, and John Castignetti are the only breeders I know of who have birds from that line.  The original line started with John Castignetti.
Edited to add:  Tail growth is the longest maturing trait of the Cubalaya.  Mr. Bender likely has young birds shown on his page, which would not have a full tail yet.  It can take up to two years, sometimes three for full maturity and growth.