Morning,
On the back of your comments and my doubts as well, I have written the journalist of the article an email last week and told her about our reservations. Yesterday, I have received an email back and she thanked me for our thoughts on this matter. The issue was further investigated and it resulted in a correction. The rectification is published on their site and picked up by many other media.
Apparently 3 or 4 white fallow does had escaped a deerfarm nearby back in July.
Regards,
Marcel