@Greenslipper4 It may be worth a call to advising to see what range of coursework he will actually be eligible to take if accepted under that category so that he doesn’t matriculate under any assumptions.
Unless there have been very recent changes, I don’t believe he will have exposure to engineering courses. On the business side, he may be able to take an intro to business and maybe accounting. Both engineering and business have specific 1st year math classes, so if he enrolls in math for the liberal arts program those credits would not count towards his major. Ditto on the intro to business course - if memory serves, that course is for non-business majors so if taken would be eligible as elective credits towards graduation.