The stated fly around separation was 400 ft (122 m). Distance from me was about 550 km (355 km ISS height and about 40 degrees elevation). Assuming they are point sources (the best case for resolving them) with 122 m separation between them, this gives an angular distance of 46 arc seconds or 0.76 arc minutes. Now the commonly stated limit for human vision is 1 arc minute and I was viewing through 10x binos (I think it was 10x, they zoom to 21x), so the two dots were separated by 7.6 arc minutes.
I'd say you are right.
I am very surprised that I could see that through binos, but the numbers make sense.