Thank you all for your feedback. Indeed, I have one of the original 2011 manuals that says:
SAE viscosity No. and applicable temperature
5W-30* (Whole temp band)
5W-40 (Whole temp band)
10W-30 (-20C to top of band)
10W-40 (-20C to top of band)
If the vehicle is used in desert areas, in areas with very high temperatures, or is used for heavy-duty applications, use of oil with the following grade and viscosities is recommended.
API classification SN (or SM):
SAE viscosity No.: 30, 40, 10W-50,
*: 5W-30 is recommended.
I must have the addendum around here somewhere, but I'm thinking I made my oil choice before receiving it. I seem to recall being under the impression that the addendum only included a requirement for synthetic and a maintenance interval of 7500 miles, no changes to the allowable viscosities, but obviously the images above indicate otherwise.
And while Rotella is, in fact, marked "SM," it does not include the "Energy Conserving" provision.