Are fields that specify 'For ADD operations only' selectable?

I'm not sure whether or not to expect these fields to be returned when querying against the API. The language '' implies they wouldn't be returned but then in the small print the documentation also says 'This field is read only and will be ignored when sent to the API for the following Operators: REMOVE and SET.' implying that the field can be read.

I've noticed this on several fields but here's an example of one that has it: https://developers.google.com/adwords/api/docs/reference/v201605/AdGroupAdService.ImageAd#adToCopyImageFrom

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