Ok, we've talked it over, and we're going to change the graphic and some of the text from that topic. The 10.0 web help will update, and it will be changed in a future service pack as well as in version 10.1.
Thanks for bringing this to our attention.
As for which is better, it's really a judgement call. Personally, I still like the model on the left because both the root-mean-square and average standard error are lower than the model on the right. A large difference between the RMS and the average standard error can indicate model problems, but a root-mean-square standardized of .85 indicates that the problem is not severe in this case. And the one point on the x-axis of the LPI model is also concerning.
When we change the graphic, we'll find an example where a lower RMS clearly does not imply a better model.
The formulas for the crossvalidation summary statistics can be found in Appendix A on page 273 (page 279 of the pdf, since the first six pages aren't numbered).