BVidlar - “For David is not ascended into the heavens…” (Acts 2:34).
Bad quote, "For it was not David who ascended into heaven..."
or "For David did not ascend into the heavens but he himself said.."

Peter is explaining Ps.35 and he is clarifying that it wasn't David
that was to ascend and sit by the right hand of God, but it was Christ.
He is not saying David is not there now, he is saying David wasn't the one
to fulfill this prophecy it was Jesus.

Therefore David can be there right when Peter said this.

Thanks for the comment.

RJ