SCP-exclusion form deferral opportunity for HCE under safe harbor nonelective 401(k)

Does the assumed 3% missed deferral apply to both HCEs and NHCEs in a 3% nonelective safe harbor 401(k) plan.

I believe it does so that for the period of exclusion the HCE would get .5*3%=1.5% QNEC but of course not receive the 3% safe harbor contribution since not an NHCE.