No, I have the LA1 (3400v6), not the LD9 (2.4 twin cam), and the Alero came stock with the 4T40E (LD9 from 99 to 01, and the L61, 2.2 ecotec from 02 to 04) or 4T45E (LA1).
I may end up doing the flush myself. Adapted from the videos, I would disconnect the return line from the radiator and run a hose from the radiator side to a bucket or container of fresh atf, and I would run a hose from the trans side to and empty bucket. Start it and run it, until the fluid starts to run clear and red. The hose in the bucket of atf would keep the system from sucking in too much air (I know some air will get in on the filter change, I just mean during the flush), and I should be able to do this myself, although I would probably end up enlisting the help of a friend just in case.
As for the life of the trans, on tax time, I may just pull it and get it rebuilt, or buy one already rebuilt from rockauto. Theirs are rebuilt and tested before shipping, and one I saw carried a 3yr/unlimited mile warranty. If I get the one from rockauto, I can just wait and pull the old one when it arrives, so as to minimize downtime.