4s may post up, as do guards, but in my book a post player is a center. Wikipedia also recognizes that the terms can be interchangeable.
"The
center, colloquially known as the
five or the
post, is one of the standard
positions in a regulation
basketball game and is commonly abbreviated "C". The center is normally the tallest player on the team, and often has a great deal of strength and body mass as well. A typical
NBA center is between 6'10" (2.08 m) and 7'3" (2.21 m)."
Maybe it is a geographic thing.
So, to make everyone happier, Maryland has the top center, which was my overall point, that Maryland is bringing in top talent that DD can feel comfortable about playing with.