If GPA is not on a 4.0 scale will it count toward rankings?

I just found this on Poets & Quants under the comments section:

DanPoston • a month ago
"I am an MBA Program Director at one of the schools on the list above. Unfortunately, comparing these schools on GPA is undermined by the lack of a common and enforced standard on calculating GPAs. The variations are more likely from different methods of calculation or different priorities in admission. Several years ago, schools did reach agreement on a standard, but shortly afterward, the enforcement mechanism went away. I speak to colleagues about this issue frequently and find there is little common ground. Just last week an admissions staff member at a top 25 school called me doing a survey of how schools calculate GPA. She was hearing different approaches from different schools. With the turnover of admissions staff, memory is short and few people even know there ever was a standard. Surprising to many, the "standard" required us to exclude candidate's grades from a school not using a 4.0 system. This means the GPA average at schools with large international populations could exclude the grades of up to half the class. However, some schools used various algorithms to make a conversion. The "standard" required that we use only the overall average of the degree granting school printed on a formal transcript so it could be audited. Of course this excludes transfer grades or graduate school grades that often increase the overall GPA. Some schools use only the last two years grades. Many schools run a calculation using their own methodology. My school only runs an overall class GPA average for US News. No other entity, including my university, seeks it. Further, while the GMAT figures into multiple rankings, the GPA figures only into US News at a small percentage. As we evaluate each candidate, the GPA is a very important factor, but as you mention in the article, it is weighed in combination with many factors. However, in the overall scheme, the aggregate GPA matters little and for the reasons above it doesn't tell a candidate much either. Given variations in calculation, with the GPAs at all schools varying by only a couple tenths of a point it's hard to decipher anything from the US News GPA numbers."