It is possible that the perpetrator actually knew Cindy and knew her car and specifically targeted her. However, it is also possible that she was a victim of opportunity, sighted by the perpetrator parking and exiting her car in the parking lot. He could have simply punctured the tire and then cruised around until he saw her again at her car. He might have offered to help her and then abducted her when he felt the time was right.
This occurred in the same time frame and general geographic area of the known Zodiac killings, and it does seem similar to the Kathy Johns case in which a man (believed by many to have been Zodiac) pulled her over and offered to tighten the lug nuts on her "loose" wheel, then abducting her and her baby when the wheel fell off the car (he had actually loosened the nuts).
A major difference between this case and those of known Zodiac cases is that Cindy remains missing, whereas Zodiac's known victims were all found where he attacked them.