Hi there - Sam from Moz's help team here!
If I plug in that exact URL, I am now seeing the same results that Linda mentioned for the DA (5) and PA (21) (with and without the https). I'm also seeing 6 inbound links!
Something to keep in mind is that is actually expected that we won’t find every page and link because we aren’t looking for them all! When we collect this data, we’re looking specifically for the most valuable links and, rather than crawling your entire site or every site, we collect this by starting our crawler on a few highest ranking sites and letting it perform a breadth first search to see what it finds.
For each page that we crawl, we first collect each of it’s links before following these and collecting the details of each page that these link to and so on. There’s a set limit of links that we’ll crawl per page and pages that we’ll crawl per site so it’s expected that we may not follow every link on a site this way.
So, if we haven't followed all of the links that exist because of this, they won't contribute to your overall DA or PA.
Most new sites and links will be indexed by our spiders and available in Mozscape and Open Site Explorer within 60 days, but some take even longer for many reasons - including the crawl-ability of sites, the number of inbound links to them, and the depth of pages in subdirectories.
You can see our most recently updated schedule here as well as some more technical metrics on our Mozscape API Updates page.
I hope this helps! If you have any further questions, feel free to pop an email over to help@moz.com (our response times can be quicker there:) ).