Doesn't pass the smell test since the chart for government employees clearly includes more than just Federal. The Federal workforce is about 3mm, but that graph shows 23mm [1], so it clearly can't just be Federal employees.
EDIT: here you go, just looking at Federal employees [2]:
Jan 2021: 2.89 million
Jan 2025: 3.02 million
The Federal government added ~130k employees over the four years that Biden was in office, an increase of about 4.4%.
During that exact same period, all private employment went from 121 million to 135 million, an increase of about 11%. So Federal employment grew slower under Biden than private employment did. [3]
Sources:
1. Total government employees: https://fred.stlouisfed.org/series/USGOVT
2. Total Federal government employees: https://fred.stlouisfed.org/series/CES9091000001
3. Total private employment: https://fred.stlouisfed.org/series/USPRIV