Yes, alumni can retain access to EEE/Canvas. However, keep in mind that the classes may be listed under "Past Enrollments." To view a list of classes, go to canvas.eee.uci.edu/courses.
Depending on the settings your instructor has implemented for the course, you may also no longer be able to access the course space. In these cases, if you would like access to those courses, you will need to contact the instructor directly, as access to course material is entirely at their discretion.