Which is why I posted it relative to long-run averages. There are birth/death adjustments every period. But over the long run the methodology is the same. Look at the NFP graphs. The market has improved substantially since the bottom in 2009-10. We aren't back to peak numbers of employed (2007-08 bubble) but well above the prior cycle (pre-2001 recession) highs.
Here are the Shadowstat unemployment figures. Red is U3, Grey is U6 and the blue line uses the pre-1994 methodology - which is U6 + long-term discouraged workers.
The Shadowstat figures are the closest approach to the key metric of "people who could potentially work but who aren't working".
Hope this is helpful.