They're probably counting e.g. SWEIII with an intern. Still, I'm more amazed that a single person has done feedback session with 9000 people in two months ;)
Two months are around 40 business days, which gives over 200 people per day,
or one person every two minutes. The only way this would be possible is when
he did mostly collective sessions, which heavily undermines the impressivness
of the feat.
*she
My guess would be that the "conducting" sessions actually means sending out 9000 emails with a link to a survey.