Incidentally, the production process of checking print pages before they go to press, or are published digitally, is known in the industry as a “preflighting”.
Are editing and Preflighting the same thing?
What you have described, to me is "editing". As I understand it, editing is the act of checking the content is valid, understandable, meets the agenda and has no spelling or grammatical mistakes.
Preflighting is the act of checking that all the required digital pieces are together before printing. For example Indesign has a preflight feature which checks that all of the images and fonts are gathered so that when an output is done you're not missing bits from the PDF.
Either way, Editing is an age old probably that seems to have gotten worse as the digital era has matured