I too will ditto that it is a "Water Closet", by victorian terms...
But by the NEC version, it would have to have a basin...
Bathroom. An area including a basin with one or more of the following: a toilet, a tub, or a shower.
However the commentary to 210.8 (Not considered CODE.... And subject to interpetation.) defines it slightly differently
A bathroom is defined in Article 100 as an area that includes a basin with one or more of the following: a toilet, a tub, or a shower. The term applies to the entire area, whether a separating door, as illustrated in Exhibit 210.9, is present or not.
Shows a tub and toilet in seperate area, from the basin. But also doesn't show outlets in there either.