This assumes that there is no overlap between the ABET curriculum and the business curriculum. In most cases, that would be a reasonable assumption.
However, my understanding is that the Lehigh CSB program includes a sequence of “CS applications in business” courses that are accepted as CS electives by ABET, and also as business electives by AACSB. In effect, they have designed overlap between the CS and business degree curricula, where usually there isn’t any. Since Lehigh has courses that “double count” towards both majors, it makes it easier to meet the dual accreditation requirements.