No, the limit is 80 characters, and the current title is 73, so "Series " would fit. Also, "2.3k", besides being confusing, is not actually an abbreviation of 2297. len('2297 Patch Series Would Improve Linux Build Times 50~80% & Fix "Dependency Hell"') == 80. Better would be to replace "Patch" with "Commit", since that's how Molnar describes it, but that would take rewording (or removal of quotes) to fit on HN. "Times" -> "Rates" would be sensible too.
who knows if the title of this post has been edited or not since then, there are no indicators whether it was or not edited even if it was in the past...