The incident supposedly did not have a noticeable negative effect on the production of the microchips for the upcoming generation of iPhones, but considering the tense situation on the semiconductor market, even small delays could eventually have major repercussions.
https://www.notebookcheck.net/Apple-s-chip-production-for-the-new-iPhone-13-is-reportedly-impacted-by-contaminated-gas.552862.0.html