There are a couple of things.
First, everything the Prime Minister receives, he spends a lot of time with and most definitely reads. I can confirm that if they are documents that he received, he absolutely read them.
Second, he's briefed on matters of foreign interference and matters of election foreign interference, as per the documents you have received, on a regular and ongoing basis.
Third, on the specifics of what you were referencing, I can't, unfortunately, in this public setting, get into what was or wasn't briefed on at the level of specificity you'd like.