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It is certainly permissible to change the reported DOFD if it is subsequently determined that the prior reporting was inaccurate.
FCRA 623(a)(2) requires correction/update of any reporting if it is found to have been inaccurate.
What is improper is to change the reported DOFD to another date that does not reflect the actual date of first delinquency in the chain of consecutive delinquency that led to the charge-off.
The issue is thus not that they have changed the reported DOFD, but rather whether the new DOFD is accurate.
If you have records showing when you first became delinquent, and that you thereafer remained delinquent up to the taking of the charge-off, you can file a dispute with the CRA contesting the accuracy of the DOFD.