Both claims are correct, as is common with statistics.

If you write `print "hello"`, you just increased the QUANTITY OF PYTHON 2 CODE. If there is one guy left in the world who occasionally writes some Python 2--and even if he's the only one left who does--the quantity of Python 2 code will, in some sense, "keep on growing", regardless of what happens to Python 3.

The article you cite refers to PERCENTAGE OF LIBRARIES that support Python 2 or 3, either one or the other exclusively or both, and it demonstrates a decrease in libraries that only support Python 2 and an increase in libraries that only support Python 3. This is presumably correct, too, but it doesn't suggest that nobody writes any Python 2 code anymore.