No, I would like for this tool to work with deactivated accounts so that data can be retrieved in the event of Google deciding to deactivate the account.
You could achieve the same goal if they let you reactivate the account and then retrieve your data (either with this tool or with IMAP).
I suspect that the tool works by taking the data from the same storage that is used for active accounts. So, assuming that your data is still there, they would have two options: a) write another tool that exports data from some backup or b) first restore the data and then export it.
In any case I don't find your feature request to be relevant to this topic. Sorry for nitpicking :-)