How is the rule "We make a change of more than 4 hours to your departure time" interpreted? For either a departure or a connection? If you are traveling AAA-BBB dp 1000 ar 1200 BBB-CCC dp 1300 ar 1500, and then change the connection to lv 2000 ar 2200, they haven't changed your original departure.
Regarding the OP, is it possible that they cancelled the connecting flight, and that would be justification for a refund?