How odd. It looks from what I can see of your scan as if they're claiming that Christopher Lee did 12 Dracula films. But from my own knowledge of his work, I make it seven Hammer feature films, plus El Conde Dracula directed by Jesus Franco in 1969 (produced in Spain, with Klaus Kinski a very disturbing Renfield) and a cameo as Dracula in The Magic Christian.
I'm again very surprised that Barnabas was included at all in such an article. It's almost starting to remind me of "that year of insanity, 1968"--everytime I turn around, I see Barnabas! Nice to see this surge in his popularity!
G.