Imore does have a point. CR got 3 widely different battery life test results. Won't that suggest that something might be amiss with their battery testing methodology? Instead of ascertaining the reason behind this inconsistency, CR is opting to write it off as the MBP's problem.
Some people here are suggesting that the MBP was rushed. Seems the report by CR was rushed as well to meet a certain deadline and fit a certain narrative as well.
Consumer Reports isn't Apple QC. It isn't their job to determine why they're getting the results they're getting because they aren't Apple engineers. As long as they follow the prescribed testing methodology (and perhaps this should include more than one round of tests on more than one machine, granted), they're doing exactly what they're supposed to be doing: reporting.
Getting (wildly) inconsistent results between tests certainly leads one to speculate that a software or firmware fix might be possible, but I guess the root problem must be identified first. And unfortunately Apple has a pretty bad track record of being up front and acknowledging problems that are evident to their users.