What G Dee P does all depends on what you want him to do, or more important, want him to become.
If you want him to be a recurring villain, he should be smart enough have an escape plan ready and saved some cash. He should be long gone.
If this was G Dee P's entire operation though, or he spent most of his previously ill-gotten-gains on pimping out his crib and wasting it on hookers & drugs/BTL or something, have him be arrogant enough to make a stand in a "You think you're bigger than me? You think you can take me?! I'm G Dee P man, I killed dozens of guys just like you before!" and have them kill him.
The second option will probably give the players a more rewarding feeling and imo fits better. His operation sounds a little bit too small-scale for the antagonist to suddenly become a mastermind.
Do NOT be afraid of not having them have the money and having them "find" another pile just identical to the one they lost. They blew it up. They just learned a very important lesson to professional shadowrunning: Avoid collateral damage if possible, best case it'll just cost you money, worst case it'll cost you your career or your life. Seems a very good lesson for a starting group. This isn't DnD where you'll always magically find treasures after each fight.
But, if you want them to have some money to spend on new gear, monthly rent and medical bills, you can perfectly combine it with getting the hacker more involved:
If GDP's been falsifying records of people to make them seem like corporate employees, it must mean he -or (a) hacker(s) working for him- has backdoors into a lot of very important databases with law enforcement, medical, political and corporate data. There's an entire black market just for false ID's, those things are BIG business. Heck, GDP could have probably made more money with less risk just manufacturing and selling ID's. If the hacker can get his hands on the accounts and passwords for those backdoors, your players will have paydata potentially worth a lot more than what they were initially offered by GDP.
Or, if you want to make this a bridge to a second "mission", have the hacker not find the paydata, but the location and identity of the hacker(s). Next mission: grab those hackers, get their info and sell that paydata!
Oh, and throw in some nice bots or security system the hacker can shut down at GDP's "base".
