If you carefully read the description - two things are apparent. First, turbulence is often misreported - severe turbulence is rare and many pilots have never encountered it. I reckon I have only encountered it once in over 25 years. Ans secondly, as 763 Jock says - you would delay the departure if it was forecast!
So in answer - I wouldn't take off. But if I was taking off with windshear reported, I would consider config 3 with TOGA. The reason being, you spend as litte time on the runway and it's nearly impossible to scrape the tail in that config.