That would be true of Attributes, not of regular Text nested in a Block. Attributes have their own top-level entity names and therefore entity data lists and therefore 10 codes.
If you do it with (command "_.move" YourBlockEntityName "" ...) instead of via entity data, it will take the Attributes along for the ride. It also gets around the potential problem of the insertion point being in the 10 code only if left-justified, but in the 11 code for other justifications.
Kent Cooper, AIA