Are "filmed-in-" keywords allowed?

Someone (probably just one or two contributors) has been adding "filmed-in-" keywords to indicate the geographic places where titles were filmed. The contributor is particularly focused on titles filmed in Arizona.

I believe these "filmed-in-" keywords are not proper keywords. First, they may have nothing to do with the plot. Keywords are primarily supposed to be plot keywords, and sometimes a filming location is irrelevant to a title's plot.

Second and more importantly, IMDb already has other search functions to allow searching for titles filmed in specific geographic areas. 

For example, here is a search for all titles filmed in Arizona (currently 7,795 titles):

https://www.imdb.com/search/title/?locations=arizona

Such locations searches can be combined with keyword searches. Here's a search for titles filmed in Arizona with the keyword "desert":

https://www.imdb.com/search/title/?locations=arizona&keywords=desert

Imagine if every title included keywords indicating every location where each title was filmed. That would be a lot of unnecessary (and duplicative) keywords.

If I'm correct that "filmed-in-" keywords are improper, can IMDb staff please delete and block these keywords?

There are also some "filmed-in-" keywords with only 1 title; I could handle those myself rather than asking staff to delete them. But first, I will wait for confirmation that "filmed-in-" keywords are indeed improper.