The slides of my lintian-ng presentation are available in the #Debconf25 shared repository: https://salsa.debian.org/debconf-team/public/share/debconf25/-/blob/910572409d4270759df3f714d92f3be0f82b68eb/slides/196-lintian-ng.pdf

And to hack around and contribute, do not hesitate to have a look at the git repository too! https://salsa.debian.org/gagath/lintian-ng