I'm not even sure what those numbers mean. Yes, fluoro stretches, just like nylon mono stretches, just like co-polymer stretches...
Different brands stretch differently, and deform differently. Anyone that has fished a high end fluoro like Tatsu side by side with a high end mono, like Suffix Elite will tell they do not stretch exactly the same. Tatsu (and InvisX for that matter) have quite a bit of initial stretch, but Tatsu locks down, showing the strength of it's dual fluoro extrusion, until it eventually fails. My experience is that the point of deformation and failure are very close. Not all lines are like this, and nylon mono not at all like this. But, your mileage may vary - these are just my personal observations both on the water and at the bench.