Did the Biden administration go into the offices of social media companies and purge the posts/data?
Every administration pushes back / pressures entities about messages that they think is wrong. Every administration has a message and story that it wants told. It's what press offices are for, for example. Remember, in 2017, when White House press secretary Sean Spicer said Trump's inauguration had the largest crowd's in history of inaugurations?
* https://www.bbc.com/news/world-us-canada-38707722
But this is about purging raw data that is used for analysis, and not a particular story. (The data can be used to support or debunk a particular message of course.)