All in all, it's a sloppily written article by a reporter who was obviously not familiar with college baseball recruiting. It would be a mistake to use whatever hearsay the reporter accepted as the basis for believing UT committed a recruiting violation.
It's not the only thing in the article that didn't quite add up.
For example, it reports uncritically the assertion that he one of MS State's top recruits while also accepting that MS State pressured him to decide now. Well, the only pressure a school can exert is to threaten to pull or reduce the offer. As a rule, that only happens to replacement-level recruits, not the top stars. Top prospects get to take as much time deciding as they need.
Also, the article said he already "passed his ACT." Well, the ACT is not a test that people pass or fail. You just get a score, and the schools and the NCAA decide how to interpret that score. Maybe the player scored well enough to be an NCAA qualifier with his projected GPA, but the reporter was too lazy to clarify and too uninformed to know he should have tried. It shows the he was just cranking out a puff piece on a local kid and passing along uncritically whatever he was told.
Unless the recruit produces phone records, the alleged call is just self-serving folklore.