I hate to break this to you but the article wrong. There are pictures of him.
Quoting:
"this is the first picture of Kevin Rountree, the publicity-shy boss of the company behind Warhammer miniatures"
"surfaced last week at the firm's Nottingham HQ where he was up for re-election at its annual meeting"
"He isn't interested in publicity and is not on social media"
Anyways, the original point was, that it's crazy sounding that one of the largest companies would have a CEO that nobody's seen (apparently agreed upon by the Dispatch, and the Daily Mail, and the Financial Times [2]). The image on the Warhammer wiki is possibly the same (looks kind of different than the Daily Mail pic)
Quoting Financial Times:
"its chief executive, Kevin Rountree — formerly of the firm now known as PwC, and farmer-and-British-posho apparel provender Barbour — has virtually no profile (the Sunday Times, which recently listed Rountree as one of its businesspeople of the year, had to use a photo of an Ultramarines Space Marine instead). “He’s a real person — he’s not some kind of character out of Warhammer 40k,” Ashworth-Lord told us."
"Obviously, if someone does have a photo of big Kev or wants to let us know if he’s a slandered South Shields sand dancer or similar, we’re contactable in the usual ways."
There's a possibility the Games Workshop wiki image is a generic stock business person place holder.
The Australian science fiction writer Greg Egan strongly asserts no image of him appears on the internet ... and yet images are returned if you search his name and profession ... they are all different.