The initial crossed pod produces F1 seeds. F1 seeds produce F1 plants (which makes sense because a seed is basically a baby plant). F1 plants produce pods with F2 seeds. So the seeds you harvest are one generation ahead of the parent plant.
When you buy F1 strawberry seeds from a breeder, you're not gonna get a bunch of variation. Which you would get if F1 seeds produced F2 plants (like in Paul's theory).