Here's a more detailed Reuters article, which also links to the original NY Times article. The News24 article did not provide such a link (bad journalist!).
https://www.reuters.com/world/europe/evidence-suggests-errant-ukrainian-missile-caused-market-deaths-new-york-times-2023-09-19/

The claims are also refuted in this article: https://www.pravda.com.ua/eng/news/2023/09/19/7420435/

Pravda's claim that the Buk air defense systems are not in service does seem valid as it was reported way back in April 2023 that Buk missiles were going to be depleted by May 2023. https://time.com/6271538/ukraine-air-defense-shortages-russia/