Per the admissions documents at Texas A&M International ...
"Men's tennis, women's tennis, men's baseball, women's softball and track and field will also be offered as demand, funding and facilities make their implementation a positive move for the University." (written in 2003)
It sounds like that there was a demand and they are planning on starting the program (based on your post). I would imagine that they would stay NAIA in all sports.
Call the athetic department and find out !!!