The semantics of it are silly and pointless to discuss, since she's not accelerating those extra 84MPH using only her own power. There's a lot of aerodynamic influences happening here and this is more of an engineering feat than an athletic one.
It's also an engineering feat, but again TFA: "As they targeted the overall record, their team revamped the same dragster that was used to set the men's record" -- they're reusing last time's engineering.
Yes, she also needed to accelerate from 100 to 184, which (I am guessing) is a significantly lesser feat than maintaining a balance on a salt lake surface and keeping herself in 3 meters of a slipstream area. This is all remarkable, but the point was that this setup is probably not what most people would imagine when told of "a woman riding bicycle at 183.9 MPH".