Morocco textual history is at https://github.com/eggert/tz/blob/main/africa#L628 and the implementation rules are at https://github.com/eggert/tz/blob/main/africa#L903

Just above that is this bit:

    # From Paul Eggert (2020-05-31):
    # For now, guess that in the future Morocco will fall back at 03:00
    # the last Sunday before Ramadan, and spring forward at 02:00 the
    # first Sunday after two days after Ramadan.  To implement this,
    # transition dates and times for 2019 through 2087 were determined by
    # running the following program under GNU Emacs 26.3.  (This algorithm
    # also produces the correct transition dates for 2016 through 2018,
    # though the times differ due to Morocco's time zone change in 2018.)
    # (let ((islamic-year 1440))
    #   (require 'cal-islam)
    #   (while (< islamic-year 1511)
    #     (let ((a (calendar-islamic-to-absolute (list 9 1 islamic-year)))
    #           (b (+ 2 (calendar-islamic-to-absolute (list 10 1 islamic-year))))
    #           (sunday 0))
    #       (while (/= sunday (mod (setq a (1- a)) 7)))
    #       (while (/= sunday (mod b 7))
    #         (setq b (1+ b)))
    #       (setq a (calendar-gregorian-from-absolute a))
    #       (setq b (calendar-gregorian-from-absolute b))
    #       (insert
    #        (format
    #         (concat "Rule\tMorocco\t%d\tonly\t-\t%s\t%2d\t 3:00\t-1:00\t-\n"
    #                 "Rule\tMorocco\t%d\tonly\t-\t%s\t%2d\t 2:00\t0\t-\n")
    #         (car (cdr (cdr a))) (calendar-month-name (car a) t) (car (cdr a))
    #         (car (cdr (cdr b))) (calendar-month-name (car b) t) (car (cdr b)))))
    #     (setq islamic-year (+ 1 islamic-year))))