If you mean, does it delete your data… Not exactly. IIRC when you delete your account it disassociates your comments and your screen name (e.g. your comments remain but it shows as [deleted] instead of your s/n). But doesn’t actually “delete” your data. What I mean is that in their databases, likely they still retain your email address/screen name/ip address/browsing history/etc, even if you take the time to delete comments and posts before you delete the account.

But more importantly, I don’t believe that OP is entirely correct (last line is wrong) either. Doing this just requests a report on what data they have about you. It does not say anywhere that they will get rid of the data. As to whether or not you can request the report after deleting your account… I have no idea. Possibly but I would imagine they would make the excuse to say they can’t though.