Probably too excruciating an issue to raise
Porsche has not competed in F1 since its failed engine programme in 1991 with the Footwork team, pictured below.
The photo referenced in the article is of Alex Caffi in a Footwork at Spa (entering Eau Rouge) in 1991. The Porsche engine the article references was abandoned by Silverstone, a few races earlier - so the example in the photo is Ford powered.
I'll pick my anorak up as I'm leaving.