40 years ago there was a big tree in the middle, but……. It's other people's cemetery so I don't recommend it, but if you go all the way to the back you can see the difference in elevation, and from the shape on the map it does look like one. Now it's just an ordinary cemetery.

Hardly any trace of the kofun remains; it's become a communal cemetery.

I didn't know this was a historic site. It's now a local cemetery. Apparently half of it is residential land and half is a cemetery.