A possible reason is that the layoffs are localized to the tech industry so far, but not all (perhaps even most?) tech workers don't work in the tech industry -

A possible reason is that the layoffs are localized to the tech industry so far, but not all (perhaps even most?) tech workers don't work in the tech industry - they do tech work for other industries such as construction, finance, health etc, either embedded directly or for companies that specialize in providing tech services to them. So until those industries are impacted by the recession they won't see the same layoffs.