Two line below that, where it says where .SitePages.ByDate.Reverse “Type” “post” which means “Filter all the pages (ordered by date descending) where the type attribute is post”. Though I think that the line below that is weird because it’s referring to .Paginator.Pages and not the $paginator variable you save things to.
Precisely what theme are you using and what are you trying to achieve?
I should also note that for customization questions the Hugo docs and forums are almost always better than Micro.blog — the answers are the same, someone has probably already asked and provided sample code, and if not, there are far more experts to answer. There are only a few of us on here with Hugo experience.