I wouldn’t avoid a class offered at your school based on “I’ve heard”, especially related to major, but kids do take summer classes.
My daughter took her gen ed science over the summer - and interned. I get what you’re saying about interning - but if you find an asynchronous class, that could work with your internship.
Otherwise, if for Fall, why not work with the local community college? You might even find a class you can go in person. UT perhaps has a relationship with them - and make sure it will transfer. UT likely has a list of schools and classes they will accept transfer from.
So if you do fall and rethink and decide to do summer, make sure you search their transfer database for an acceptable class to begin with. But check with your major advisor to see if this is even considered appropriate.
Good luck.