Based on old rehab project, I wouldn't be surprised that this is a old house and what we are looking at is the floor drain.
Some time later, a shower was installed and and the drain was centered over the floor drain. They may have placed some cement of motor around the floor drain and then just placed the shower drain tail into the floor drain!
Had a friend who's kids purchased an old house with a finished basement. They always had a problem with getting a wif of sewer now and then. When they redid the basement they found the exact same situation that is in the photo.