Earlier quoted context omitted.
This is related to Taleb's observation that employment is a kind of "slavery". What he means by this is that you effectively have sold your option to own those to outsized returns in exchange for a regular paycheck.
That sounds more like an option pair for an equity. Both your upside and downside are limited and you get a steady income stream. Slavery is very different.
If you only have had one employer for a long period, this is a large blow. Taleb makes the point that the taxi driver is in an enviable position compared to the salaryman for this reason.