How do I erase my iPhone 4 data and activation lock remotely?

I sold my iPhone 4 and was completely brain dead - I didn't erase my phone data. The buyer is remote and is being asked for my passcode. I've gone into Find my Phone and erased the data, which will happen once it's connected to the internet - however, he can't connect to the internet without my passcode.
Is there a way to remove the Activation Lock and erase my data remotely without the buyer seeing any of my data? Everything I have seen suggests removing the iPhone 4 from my Find my Phone first, and then erasing the data. How does this work if I have removed this phone from Find My Phone? I'm unsure how I can erase the data remotely if I have turned off Find my Phone.
Any insights?
Thanks

Is Find My Phone turned on?
You'll have to login to iCloud.com, from any computer, locate, then erase your phone. Once done, restore from backup, if you have one.
That's the only way for you to fix this.
It's will not work if the phone is not connected to the internet.

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