He never mentioned anyone else in the Hannity interview. However in his own words on last Saturday "It was a short introductory meeting. I asked Jared and Paul to stop by. We primarily discussed a program about the adoption of Russian children that was active and popular with American families years ago and was since ended by the Russian government, but it was not a campaign issue at the time and there was no follow up. I was asked to attend the meeting by an acquaintance, but was not told the name of the person I would be meeting with beforehand."
Notice he says person. Not people.
How does that translate to:
"Trump, Jr. told Hannity no one else was in the room"?
He's referring to a conversation about the meeting that took place before the meeting was even held.