This can just be seen as a reporter's error, but since they mention the place a few times, they seem pretty sure about where he went.
He'd announced they were going to write something for Mills movie. So we know this movie is The Family Way. From other sources we know that this plan came about just before he went off to Nairobi, and while Lennon was still in Spain. So somewhere before the 6th November. At this writing, they say the film is bearing the title The Family Way, and we know it was released on the 18th December, 1966. We know this because the music was only finished 2 weeks before the film was released.
The property McCartney moved into was 7 Cavendish Avenue, St. John's Wood, London. Purchased in April of 1965, he moved in by March 1966. So in this article we have jumped from what seems to be late November, early December, then back to March, all the way back to ... a moustache. So this has to be somewhere in December this article is being written. As Paul hung on to this moustache long after his return from .... Tunisia.
Just a geographical reference to where Tunisia is if you're a holiday planner.
Well.It's kind of close to Spain. But pretty far away from Kenya. I wonder why they're saying Tunisia so imploringly. Probably just an error. We'd have to go to the Beatles camp for the REAL story and location.
Oh wait. We cant even go to them, because Paul's pretty insistent he met Mal Evans on the 12th of November, 1966, where Mal says they met on the 8th of November, 1966, making that ten day holiday with a return on the 19th November, 1966 make much much more sense. Considering the literal thousands of miles they covered taking it. And all the groovy things that happened.