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.

researchgate.net/publication/346413716_A_review_of_SARS_Lab_Escapes_in_2003-2004

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:
publish.csiro.au/MA/pdf/MA08062

And that:
bio2ic.com/static/uploads/files/adp-tradeline-wfnsektnozas.pdf

And these very useful tables:
bio2ic.com/static/uploads/files/9-2-construction-materials-table-wfydczmyqybz.pdf