I believe "Unknown" is only used in First Name and Last Name fields, anywhere else would cause a Suggestion.
You didn't provide a profile to review, so I can't make any definite suggestions, but with locations, if you have no idea what continent or country it is, it is best to leave it blank and mark it as uncertain. Then in the biography, you can have details about it being unknown.
If you do have an idea of the location, such as knowing the parents were born or died in the U.S.A. for example, you could put the location as "United States of America" and still mark it as uncertain, as well as details in the biography about it being a guess based on the parents information.
Even the best guess at location (continent, country, state/province, etc.) is better than nothing if we can add it, since this helps with finding/preventing duplicates.
It's not uncommon for Data Doctors to fix errors on profiles all over our global tree and many of them are as speedy as lightning! DDs also have challenges to fix certain errors every week and tools to make that easier. Don't take it personally.
Remember that DDs are looking to improve profiles, Open profiles are that way so that we can all collaborate, Communication is important, but not requires for minor fixes to data issues. If assuming positive intent, then we are all working toward the same goal.
Here is a link to all the errors that can show up in a Suggestion report, link goes to Location. https://www.wikitree.com/wiki/Project:Data_Doctors#600_Location
You can always look up an error here, or click on it in the Suggestion report for more information.
There are 3 errors regarding "wrong word in location," but they basically say the same thing. "If the location is not know, location field should be empty.