5 years old, not just engineers, and doesn't contradict PIPs happening a lot. A PIP control isn't going to affect the median a ton, but can still be problematic.
Are you saying this number is significantly different now for engineers? As in average tenure has increased?
The original point was tenure is short, and no manager can guarantee that their “core” team will remain together, for any number of reasons. So letting go a “too good” engineer to keep this team together makes little sense not that PIP isn’t happening.
The original source from Paysa seems to be down (the entire site looks down).
Edit: It's all employees, not just engineers, but I don't think engineers would differ too much.