That is correct - copyright violations are not stealing, or pirating.
But they /are/ illegal and immoral in most circumstances. Please do not
do this, or encourage it, or spread links like this. The only reason we
can have books like this is because people pay for them - that's how the
authors and the publishers make their livings. So while such copyright
violations are technically not "stealing", they /are/ a step towards
depriving people of their living, and the public of such books in the
future.
(Some people feel there are grey areas, such as buying the paper book
then acquiring an electronic version for convenience, or for reading
while the paper book is still in the post. This might be viewed as
illegal but not immoral, on a very subjective basis. Many publishers
these days have arrangements and licensing that allows you to do this
simply and legally instead of resorting to illegal tactics.)