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"Re-aging" is a generic term. Anything reported to your credit file "re-ages" your date of last reporting/activity, and updates your credit file. Most of that is totally proper.
Illegal reaging applies to those reportings that have set definitions under the FCRA, such as the date of occurance of a delinquency, or with respect to collections and charge-offs, the reported DOFD. If a date that is regulated under the FCRA is inaccurately reported, the illegal aspect arises from its impact on your credit report exclusion date.
The FCRA defines dates of adverse items based on their dates of occurence, and those dates are based on account activity, not when they are reported to a CRA.
