I can't get into the Wired article but I gather that it's talking about the ethical implications of using facial recognition/AI with the parabon-generated image. That's fascinating.
The park looks pretty large and was probably not that populated in 1990 as it is today, where you usually see "about 4 groups of hikers and bike riders per minute near the parking lot, gradually dropping off to a group every two or three minutes at the Nike Missile site" according to the Nimitz Trail link above. It looks far out enough to think that the perp was likely hunting for a victim, as it's not a place someone would just be hanging out. Perhaps the European angle meant something like he was dressed in something other than typical American exercise wear like sweats and tennis shoes.
Fingers crossed that the Parabon development leads to something. It's a huge advance and always so cool to finally see a suspect side by side with the composite!