Immediately below that, Laframboise shows IPCC material with an interesting walkback of the «2500» figure itself: «2500 + scientific expert reviewers» which comes from the IPCC's own web page IPCC's own web pages for its 2007 AR4 report.
(Worthy of note: That's a bit of a walkback from June, when House said, «We'll be supply - constrained with this product, but we'll do our very best to meet demand.»)