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The answer to your question is explained in great detail on that same site under “Canon of Old Testament” newadvent.org/cathen/03267a.htmEven according to Catholic Encyclopedia (newadvent.org/cathen/15666a.htm), the Book of Wisdom was probably not written by King Solomon and the authorship is therefore unknown. If we don’t know who wrote it, why is it in the Bible? I am not sure if this is correct, but according to Wikipedia, not even the Jews consider it as a part of their official scriptures…thoughts?
It’s a lengthy read, but very informative. Short version = because it is part of the Scriptures of the Greek Jews (Septuagint), which is the version that the NT references the vast majority of the time and is the one the first Christians accepted as their Scriptures.