It does mean something to them, but not in a way that will stop you from getting laid off; what it means is that after laying you off, they'll quickly come to regret it and scramble to try to fill the knowledge gap they now have. I know a few people who were called up by the company basically begging them to help. A couple of people I know were able to leverage this to get a short term position contracting (at exorbitantly higher rates than their salary way), and a few others instead just cackled in schadenfreude.