First off, 5 x 150m with 30s rest isn’t speed endurance. Speed endurance is training that focuses on the maintenance of maximal or near maximal speed. No one on the planet could run more than 2 of those very fast. The short rest interval will pretty much guarantee that you are running sub-maximal for all but the first rep. The way it’s being run actually won’t have too much effect on your 100m time. In fact, if you try to press and over exert yourself it could actually hurt your 100m time if you learn to run with poor mechanics and no relaxation. I know this probably isn’t what you want to hear but I actually wouldn’t be too concerned about that. In fact, because of the setup of that workout (short rest intervals, intensive tempo paced running, etc.) the very things that could make you hurt so badly while doing that workout could be the same things that make you succeed when running one all-out 100m race.