Though I am not the submitter of the sequence data, can I correct the data?

DDBJ only accepts update requests from submitters of the data except publication reference update.
If you are not the submitter you will need permission from the submitter before requesting update.
See Rights and Duties of Submitter

DDBJ can forward your comments to the submitter.

Please contact us at Inquiry to the sequence submitters.
Please note that we can not guarantee any response from the submitter.