During the entire period of the "non-poaching" agreement, many other non-cartel bidders for tech talent were vigorously operating in the same market. If talent outside the cartel was underpriced, others would pay its full value.
Also during this whole period, industry salaries soared, and the number of opportunities at smaller companies (non-cartel bidders) multiplied.
Unless you spent time as a long-tenured employee at one of the specific cartel companies, their non-poaching agreements likely did not affect your compensation level.
And, to the extent cartel employees realized they could make more in the (large and growing!) non-cartel world of startups and smaller firms, they could (and did!) leave quite often. If you've worked with ex-Apple, ex-Google, ex-Intel, ex-Adobe, etc people, your projects' success and resulting total compensation levels may actually have been higher because of the stinginess of the cartel.