With a daily readership of about 260,000, it is the fourth largest circulation figure in the U.S. That is hardly “zero” credibility. They report accurate news the formerly great The New York Times does not seem to care about.
The formerly great The New York Times has had some credibility problems of its own😥. At times, it now seems the house newspaper of the Democratic Party.
Best to be cynical of all news sources (including the NY Post) and realize their bias and read it accordingly. Best to be informed from a variety of sources (I recommend The Economist) and especially foreign sources to get a broad picture.