Possibly, but arguing against that are three factors: 1) the sub was tiny and its possible it wasn't actually loud enough; 2) the sub was at a depth that SOSUS

Possibly, but arguing against that are three factors: 1) the sub was tiny and its possible it wasn't actually loud enough; 2) the sub was at a depth that SOSUS doesn't listen at and sound propagation underwater is very complex; and 3) there's a lot of other potential sources of noise underwater, including both mechanical like ships and biological. Even if they did detect the Titan's implosion, there's enough sources of doubt that three days ago it would've been difficult to say definitely that it was gone.