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I would guess it was not intentional to leave off Note "c" for the cooling system column for systems 10 and 11 but that said, it is not present. Almost all DX systems use electricity for cooling and if your DX system is electric I would use electric for the baseline. Since 10 and 11 are for packaged terminal cooling, the likelihood of them using something other than electricity for cooling is very unlikely. If your proposed packaged terminal DX system uses gas or some other fuel for cooling, and you want to assume the same for the baseline, to be safe, I would ask for a formal interpretation by following the instructions here.
This response is my personal opinion and should not be viewed as an official interpretation from ASHRAE.