Having worked at (and presumably left) a company when it was a tiny fraction of its current size is probably a stronger signal that you don't know what it takes

Having worked at (and presumably left) a company when it was a tiny fraction of its current size is probably a stronger signal that you don't know what it takes (in terms of headcount) to run a large company than a signal that you do. Did Twitter require just that many people? Maybe, maybe not. But a 50% haircut with no meaningful basis in role/performance is an indicator that the layoffs were anything but appropriate.