This really isn't true. Take Microsoft, for instance - one of their recent layoffs eviscerated the Principal band including a number of high performers. I'm talking people I personally knew who had climbed the ladder rapidly, were directly working with multiple external partners driving tens of millions in revenue (that is, external partner has problem, threatens to pull spend on product, this employee is one of the first pulled in to engage and get it solved), with visibility all the way to the VP level and higher happy with their work and partner teams trying to poach them away - still laid off.