Yes that is a lot of work. Add to that the element of fear if that email address is used for crypto exchanges too and as you said if he has no access to the emails he cannot reset everything.
I think it seems plausible that user "Side chain" managed to trick BitcoinGirl.Club in to clicking a link that installed malware either on the device/PC which allowed him to gain control over the email account. After BitcoinGirl.Club completes the things he needs to it would be good for us all to understand exactly how the hack was carried out so others can keep themselves safe of similar techniques.
BitcoinGirl.Club should explain what correspondence took place between him and Side chain before the hack so it can be ascertained exactly how the hack took place.
I think he has other things on his mind right now:
I had to reset my system earlier and now I am restoring everything. I have so many things to worried about not just bitcointalk account.
I'm thinking of wiping all software, reinstalling from scratch, changing all passwords, and changing the email address of any services that use the same email address. That's probably going to be difficult without having access to the email address, and regaining email access might take a while too.