They did not state that all were exonerated, said that several were, but indicated that no student had failed the class - of course, a student could have cheated and managed to pass the class despite that, but it doesn’t specify beyond the one who admitted his guilt.
"Michael Johnson, a spokesman for Texas A&M University at Commerce, said in a statement that no students failed Mumm’s class or were barred from graduating. He added that “several students have been exonerated and their grades have been issued, while one student has come forward admitting his use of [ChatGPT] in the course.”