You should probably still be able to get to it, it's just a big IF and cumbersome. If you have your username and password for your old account, you don't have to rejoin to see it. If you don't have UN & PW, just ask them for a reset.
Once you get log in, your data should still be on the website. They've actually done some great things with integrating data and historic tests, so you can get a bit of an updated analysis on migration, etc., if more has been learned about any folks that you entered, or if enough evidence has been linked to markers that you carry.
Good luck. Let us know how it goes!