I don't think this is misleading for anyone familiar with Typescript. Typescript itself has no impact on performance, and it is known that the compilation and type-checking speed is often a problem. So I immediately assumed that it was about exactly that.
When I read the title I thought maybe they implemented a typescript to binary (instead of javascript) code compiler that speeds up the program by 10x, it would also have the added benefit of speeding up the compiler by 10x!
I don't think that is too far fetched either since typescript already has most of the type information.
