According to this reddit post, the play was set by mrekk: https://www.reddit.com/r/osugame/comments/19d69bl/mrekk_enter_shikari_rat_race_themefistos_extra/

Looking at the comments of the post, we can tell that mrekk is known for doing many plays like so. We also use some key info points to find more information about the play.

We also check google for maybe some insight, where we find videos that have already documented about it.

Finally, we check his osu profile which was linked in the Reddit comments by the bot. Which seemed to return our results and conclude the research.

My judgement is that all this information is true, and mrekk really did place this play with a outstanding 1427 pp. Thank you for taking you time on reading this blog post.