Venus presents same face toward Earth at closest approach. What do you make of that?
I wouldn't call the reference dubious so much as very much out-of-date. The paper in question was written in 1969, which was still pretty early in our understanding of the dynamics of the Solar System, including Venus. There would have been a lot of uncertainty in many of the measurements, such as rotation speed, which would have been determined by radar. Consequently, the possibility of resonance was there, at least until better measurements were available. However, the wikipedia article on Venus, and the attendant 1979 paper citation (#90) indicate the idea of a resonant Venus was rejected decades ago once sufficiently accurate radar observations of the planet had been made. 

So, clarifying of the wikipedia article you mention is probably in order.