system
Given the following post, respond as if you're commenting on Reddit:
human
[Rick and Morty] How did Rick _____ if ________?

How did Rick fabricate the details of his backstory in season 3 if, as revealed at the end of season 5, it ended up being his real backstory?
gpt
Rick used his actual backstory to build his illusion in the Shoneys; the bug didn't see the real memory, just a brutally accurate simulation of it, up until the moment when Past Rick writes the code for the malicious upload. 

As far as telling the bug it was *all* a lie, Rick is an asshole, hates authority figures, and has an especially big chip on his shoulder towards the Gromflomites and the Federation. He knew it didn't matter what the big knew or didn't know, his information was safe, *he just wanted to twist the dagger in the dying bug's guts a little more before leaving*.