Are these facts true about Deinonychus (Dinosaur)?

They aren't all facts necessarily. Dromie pack hunting and fighting tactics may be true--although IIRC a more recent suggestion was that dromie pedal claws enabled the beast to climb not slash prey--killing being done with the jaws as in other theropods. The point is, the claims about behavior, while possible, even likely, can't be called factual.