Hmm, my sdi class in spring went over tables... although we did use computers on our dives. I guess it was up to the instructor.
SDI requires the use of dive computers for dive planning but tables are in the book and most instructors teach the use of tables. PADI requires the use of either tables or an electronic device similar to a calculator for dive planning. This "erdp" is a PADI product and essentially does the same thing as a dive computer does in its planning mode. Most PADI instructors now seem to be teaching the use of this electronic product in lieu of teaching tables.