I do not think so. John P. Linderman ported a C implementation of "Optimistic Merge Sort" by Peter M. Mcilroy to Perl. The comment in pp_sort.c says that this was presented at SODA '92, but that seems a typo. The ACM portal claims it was SODA '93. Citation. The article itself is downloadable - for a fee.

Now it may very well be that timsort implemented the same algorithm, but I do not recall ever hearing any reference to timsort on the p5p mailing list.