I don't think your friend is correct.
For each rectangle opposing corners are given, and conveniently the upper left corner is the same point as the original B (-3,3).
Jeremy's rectangle goes down to (3,-6) instead of (1,-3). The new rectangle has a height of 3-(-6)=9 and a width of 3-(-3) = 6. Compare that with the original rectangle with height 6 and width 4. In this case each dimension is scaled up by the same factor (1.5), so it is a true enlargement of the original rectangle.
Elisa's rectangle on the other hand goes from (-3,3) to (-2,2), which just outlines the single square in the upper left of the original. But that new rectangle is a square while the original was not, so this is clearly not a uniform rescaling of the original. Indeed the height was reduced by 1/6 but the width only by 1/4.