That's because most vulnerable workers are either skirting labor laws through the gig economy or have given up and dropped out of the labor pool altogether, which means for whatever reason they don't get counted in the unemployment rate
To whatever extent that is happening, there is no evidence that it has happening more today than it was happening 50 years ago (before globalization) so comparing the unemployment rate of today to the unemployment rate then is still a perfectly valid comparison.
OPs comment asserted that developed world workers were being hurt specifically because of the combination of free trade and a minimum wage caused unemployment. My comment was refuting that specific argument.
The stats you mention are interesting but not relevant to OPs assertion that a wage floor in developed nations was problematic in a free trade world.