That's information aplenty yielded from some bones in the dirt. How do they know it was a predator and not a scavenger? How do they know it was not an omnivore? How do they know it was not strictly a herbivore, for that matter.
The there is this gem from the article: "...and may have been covered with an early type of feather, Hendrickx said."
It may have been covered with hair or a leotard, for all we know. Conjecture and guesses.
Teeth. Most carnivore teeth are unsuited for a diet of vegetation.
A predator needs teeth suitable for killing prey, not just eating meat. And the teeth suitable for eating veggies are not the same teeth suitable for meat eating.
Compare dog teeth:
versus cow teeth and deer teeth: