Thanks. Looks like the answer to my question is no. Table goes back to 2015. “Mail volume” dropped from 154B to 116B, but “delivery points” increased from 155M to 166.6M. “Career employees” increased from 492K to 525K. So delivery points increased by 7.5%, but career employees increased by less than 7%.
“Lake Boss”‘s post was misleading, shocker. No clue where the 80% number is coming from, even compared to the “peak” in your screenshot it’s 45% (and again referring to mail only). And the number of employees is down significantly since then - https://about.usps.com/who/profile/history/employees-since-1926.htm