Nitpicking? Maybe. Would it be nitpicking to ask "Is it a genuine A9X or a Sunbird with a flare kit?" If it's important to you as an interested buyer then it's not nitpicking.
Anyway, I think the seller has erroneous end of stick. The Business Sedan was introduced in 1953, but before the FJ was released. Both the FJ and the FE had a Business Sedan variant throughout their entire model run. So it makes no sense that this car could somehow be both. Even the FE Preliminary Parts Catalogue (that was published before the car was released) shows 3 distinct models: 215 Standard, 217 Business and 225 Special Sedan. None of the Standard or Business Sedans ever came equipped with radio or blinkers - 48, FJ, FE or FC.
The Business Sedan was scrapped, but in late 1958, during the FC.
In any case, by virtue of the 4th photo where the driver's side pillar can be seen, it's a 215. A 217 should have a light switch on that pillar.
cheers
The Nitpicker