Tony Della Porta is a top expert of lab biosfety.
After doing the Singapore and Taiwan SARS leaks investigations, he was not invited for the investigation of the Beijing SARS leaks - he was too good I guess.
Anyway the WHO disappeared from the scene and the final report was was never fully released. Only a few extracts.
That set a very bad precedent for a WHO-China investigation turning into a China only one, with no transparency and an attempted cover-up.
Della Porta eventually did some biosafety consulting in China in the years following the Beijing lab leaks. You found some of his slides.
See that too: