The picture shows a youngish pregnant boar, with maybe a white foot. A cross bred Wild Boar will look like the real thing, but with the odd white foot when the cross is 15/16ths. I doubt whether the pic has anything to do with the article though.
A Wild Boar sow with young will not tolerate any human, dog, cat, fox, rat within about a 500 yard circle, and is an extremely dangerous animal and will attack. I was always careful never to go in the field with a sow with litter, and was still careful with a 5 strand mains fence between us. A brick wall will not stop a full on attack. I never looked to see how many piglets were born.
They were lucky - really lucky. Usually the sow will bark, and the rest of the herd come running, ready to kill anything and everything.
But the owners of the pigs are stupid if they allow people and dogs anywhere near Wild Boar crosses. Would they let people walk if there were lions? Wild Boar will outrun and outkill a lion. Pinky and Perky they are not!
Our ancestors knew how dangerous Wild Boar are, shame we seem to have lost that fear.