Actually taking another look at her post, I’m not sure it makes all that much sense:
On the one hand, Rhubarbarin seems to concede that in order for this woman to look the way she does, she has to eat strictly and exercise plenty. On the other hand she’s lumping herself into this person’s body type only to say that she doesn’t have to do this. Which essentially refutes Rhubarbarin’s point I think, since it seems to admit that this woman does not actually have Rhubarbarin’s genetics (ie, genetics that would allow her to look as she does without working out). That this woman has to put some serious effort into achieving the look she has.
In general I would agree with Rhubarbarin’s larger point; that the genetic component is real and while you can make significant progress towards your fitness goals, you may not attain ‘perfection’ if that perfection is due to genetics.
The way that she expressed it is rather confused though. On the second viewing of what she wrote, this sentence does look out of place (as pulykamell pointed out).
It’s out of place because you’ve essentially admitted that this fitness lady does not have your body type (i.e, the type that requires no effort), instead this lady has had to work at it, which makes your initial irritation puzzling: