I sure as heck hope not.
This would likely kill the transactions after that?
MAybe he hardcodes some trasactions in there, that are proven not refunded?
I hope not. This is crypto. You shouldn't be able to replay transactions from a fork to the real block chain and have them verified. You also shouldn't be able to just add transactions to the block chain without having the valid private key for the from address. If that is all possible then things are very badly broken.
?? The transactions were sent! He doesn't need the private key because he has the signed transactions. The same thing can be done with bitcoin if you have a valid raw transaction on a fork.
I fully assume there is some time aspect tied into the transaction hashes in order from them to be injected on the block chain. Heck, I could be wrong. But if this is possible and someone sent me coins on the fork. Then I said, hey, that was a fork, please resend, and he did, not I can replay the original transaction from the fork onto the real chain? I really hope this isn't possible. It's not exactly a double spend, but it is a similar issue.
Also, it's probably that those original inputs are no longer owned by that Address, so they transaction wouldn't be valid for that reason as well.