Hi there

From the note I understand you want to know if Tag Editor only retrieves resources that are or previously were or never tagged.

With Tag Editor, you build a query to find resources in one or more AWS Regions that are available for tagging. You can choose up to 20 individual resource types, or build a query on All resource types. Your query can include resources that already have tags, or resources that have no tags.

I hope this helps.

References:

https://docs.aws.amazon.com/ARG/latest/userguide/find-resources-to-tag.html