How to remove Google account after factory reset

Sorry, but iFixit isn't the right forum for your question. iFixit concentrates on hardware repairs and replacements, not on software issues like yours. You'll have much better luck checking out the Samsung forums or do an online search for Samsung FRP removal.

In addition, there's the ethical concerns that make us reticent to help. If you've gotten a stolen phone, FRP is designed to keep you from being able to use it and we wouldn't care to be a part of helping someone bypass that kind of security. I'm not accusing you of stealing or owning a stolen phone, but we have no way of knowing if it is or not.