I think you misunderstood the intent of gp's question. The "it" could be mean very different things:
(1) It is this particular #398 issue has something notable in it that the previous 397 issues don't have: https://this-week-in-rust.org/blog/archives/index.html
or
(2) It is the whole TWIR blog of only which #398 is merely a representative sample that has no more and no less significance than the previous issues
I think you misunderstood the intent of gp's question. The "it" could be mean very different things:
(1) It is this particular #398 issue has something notable in it that the previous 397 issues don't have: https://this-week-in-rust.org/blog/archives/index.html
or
(2) It is the whole TWIR blog of only which #398 is merely a representative sample that has no more and no less significance than the previous issues