It's not the most straightforward way of getting there, but the bottom line is yes, you can.

Find a post by that user. Any post. In any forum. You can search in one likely forum, for example, for that user.

Once you find a post by that user, click on the icon to view their profile.

When their profile comes up, there will be a link called "Search: All posts by this registered user." Click that, and poof, after 3 or 4 years, you'll have what you're looking for.