safe harbor match plan, retro amendment to make employee eligible and top heavy exemption

Plan only does deferrals and safe harbor match.  One employee met the one year wait, but not enough hours; sponsor let her in anyway.  Found out the following year, so did a corrective retro-amendment to let in the NHCE for deferral & SH match early.  Does this take away the top heavy exemption?

The top heavy requirements wouldn't apply if the plan is considered to be a safe harbor plan throughout this process, and I can't imagine that the amendment would cause any issue, especially since the participant is an NHCE.