The floor joists with nothing else attached to them may not be an issue, the single floor joist, though, where the perpindicular floor joists attach is probably your greatest likelihood for having issues. That alone probably needs the support, and supporting evidence of that is the fact that on the other side where you don't have a load bearing wall, the corresponding header is shown as triple in your 3D from the original post.
Being a row home, if you know any neighbors maybe you can see if they have similar interiors and if the same wall is in place or not. If you're a recluse, you could look online to see if you can find other similar homes on the street which are listed for sale or recently sold, and see if you can see interior photos that might show if they have or don't have this load bearing wall.
What I was alluding to earlier was an engineer might be able to say if you could make up the strength with solid blocking, but I wouldn't have a clue how much strength could be added by that.