that it does they get any tech they can so the REbels using the Old tech makes sense. example: the Ship Garris Shrike has in the HAn SOlo Trilogy, is taken and converted by the Rebels. and the LAAT's and the SPHA-T's and the SPHM-T's were obsoleted by the AT-AT and other vehicles introduced by the Empire so it makes sense that the Rebels have control of them