Yah. Different companies, have different half-lives, for eng talent attrition. So, good recruiters will get to know the companies that tend to have turn over around say, the 18 month mark. Then do cold outreach based on that, around that time according to their LN profiles.

There is also seasonality to successful poaching by industry. Eg. Finance in North America, best month of the year to poach is around April/May, because annual bonuses have paid out, and they haven't started accruing for next year yet. For instance.