Dissolution Core + 1x scripted SeBo brings a Frigate lock to 2.5 sec. And since the CovOps Cloak doesn’t do anything to reduce scan res like a non-CovOps Cloak would, then you really do get 2.5 sec.
Coupled with the fact that a CovOps Cloak only prevents targeting for 5 sec after dropping, then yes… If you drop Cloak when you see them coming in, you can lock a Frigate in 2.5 sec. Even less if they’re Shield tanked or something, since it’s 1.8 for a Destroyer. And assuming you don’t toss a 2nd SeBo or something on there for good measure.