That shouldn't appear in the index, even if it does interrupt gameplay - the largest 2% of local frametime variations are culled to avoid exactly these kinds of infrequent paging/loading based issues. The frametime variation has to be at least fairly consistent in order to contribute to the index.
The idea was to examine the degree of microstutter only, rather than other kinds of longer timescale stutter.
Oh, no, that's not what I meant. I was trying to get across the short 'hiccups' he described were probably attributed to that (the autosave), although in retrospect it was a little off topic.