Bumping this. It’s still an ongoing issue. It can and does cause confusion. Another poster just thought a thread started in February 2015 was actually started on February 15, 2021.
It’s an odd choice, since people don’t generally tend to refer to years past 2000 in this manner. I’ve never seen the construction “February '15” outside of Discourse. The only situation where I see two digit post-2000 years is when using entirely numerical dates, e.g. 2/14/15. It just seems odd to not just write “February 2015,” the standard way of writing that.
If it’s a setting that an admin can change, that would be nice to know, as we can hopefully have them fix this when we get an active admin. Users have no way of knowing whether something is something an admin can address.