I don't believe he crashed 4 times at 100mph, I think he means it can reach speeds of 100mph and he's crashed 4 times, I suspect these events are unrelated.
I've only crashed twice, once when I I was on my way back from twon and I stupidly decided to take it off road, I thopugh to myself "hmm I wonder where that road goes". The road gradually got thinner and thinner until it was just a dirt track, my back wheel spun in a pot hole and I came off into a ditch. The other time I was pulling out of work onto the main road thinking I didn't have to be carful as it wasn't frosty or wet and my back wheel sliped on a cat's eye and I slipped over. None of my accidents were serious, I escaped from both with minor bruises even though I wasn't wearing any protective trousers but I've got myself some now.