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The article doesn’t seem to mention how the sheep all died, if they were killed outright by the dog(s) or from their wounds/infection later on.  
We had a dog the size of a blue heeler attack 10 ewes in the night.  It scared the flock into a corner of the fencing and ate out their back ends and bellies… 4 died before we got there, the other 6 we had to either put down or died of infection over the next couple days (despite ours and the vet’s best efforts).  15 ewes were injured all together.
And our ewes were dry at the time (not pregnant, not currently raising lambs).
We managed to catch the dog shortly after the attack as it could barely stand it was so exhausted.
Its certainly plausible that this attack in Kent was the work of one dog, especially since these ewes were pregnant and at this time of year depending on their breeding schedule, they’re likely verry pregnant slow easy targets.
I’d guess at least two dogs though, since I’d imagine one dog would be so tired they’d have caught it?
It doesn’t seem to matter how well-mannered or gentle a dog seems at home, it’s such a deeply engrained lizard brain reaction to the sheep running away - which may be why they attack until exhaustion.  Some breeds might be more efficient at causing harm, but the likelihood of a prey-drive attack is pretty level across the board in my experience.
I’ve dealt with maybe a dozen dog attacks, and the majority of owners are in denial that their dog could do such a thing until we show them proof.  Unfortunately at times the law has to get involved.
What kinda of dogs can kill 30 sheep by themselves? >

The notorious South England Werewolf >

Not seen since 1981 >

I think it was American though. >

Nah that one was in paris. >

Yeah, but the FIRST one was in London…