Lockdown mode means you're able to use less stuff. In this case the "pass" feature doesn't exist in Lockdown mode and that's the attack target AIUI. So, if most people don't use it (because less stuff works) then it can be "successful" statistically because maybe the attackers aren't targeting the stuff you're allowed to use and you don't get exploited.

But this isn't a stable solution really. If Lockdown is popularized, NSO obviously will attack the things which are available in Lockdown. Apple shows no sign of only allowing it in Lockdown once it's actually safe - instead they've just arbitrarily decided what to allow and what not to allow.