A few things to note about this scenario, because the way you're presenting it is also misinformation.
1. The FBI is accountable to, and reports to the AG. Both the head of the FBI, and the AG were appointed by Trump.
2. The situation you are describing occurred during the Trump administrations years.
3. The FBI did not approach Facebook and tell them to hide or claim anything about Hunter Biden's laptop. They warned Facebook about misinformation campaigns that would be similar to 2016. Facebook made the decision to restrict sharing of the story, probably because it seemed shady as all hell.
4. Hunter Biden wasn't running for President.
5. Hunter Biden may be an idiot, but his father is not. Joe Biden has done nothing wrong and even though Facebook has expressed regret for the action they took, voters weren't prevented from knowing anything about Joe Biden that they should have known prior to the election. At least not anymore than I feel duped because we didn't get official stories about Trump's son being a cokehead.