It's not quite a contradiction. The first excerpt says that every
address matching fe80::/10 is reserved for link-local use. The
second says that actual link-local addresses will use only the tiny
fraction of that space which matches fe80::/64. You could consider
the space in which the 54 bits just after the first 10 are not all
zero to be either "wasted" or "reserved for future link-local
variants".
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