How did the Wrangel Island Mammoths become extinct?

A recent study published in Cell Press challenges the central hypothesis of what caused the woolly mammoth extinction on Wrangel Island around 4,000 years ago. The research team, led by evolutionary geneticist  Love Dalén, studied 21 wooly mammoth genomes that spanned throughout the 50,000 years of their existence, including when they resided on Wrangel Island. These mammoth genomes were collected from mammoth bone fragments, tusks, and teeth found in Siberia and Wrangel Island to extract the DNA for their analysis. The findings showed that despite being a small population of at most eight mammoths, the population still grew to about 200-300 individuals and remained stable until their extinction. The population would then continue to live for thousands of more years, which contradicts the idea that the population of the mammoths on Wrangel Island was always on a decline.
Contrary to the earlier hypothesis, which suggested that inbreeding and genetic mutations caused the mammoth's extinction, the analysis presented that the most harmful genetic mutations in the mammoth population became less frequent over time, most likely due to natural selection wiping out the carries of the harmful genetic mutations. This indicates that the Wrangel Island mammoths were not genetically doomed from the start but were wiped out by a significant event like a disease outbreak or a sudden environmental change that led to the mammoth's extinction. Using computer modeling, the research team compared the genomes of the found woolly mammoths to the genomes of modern elephants and humans to determine the impact of genetic mutations over time. The research team concluded that while some detrimental mutations did appear, the overall genetic health of the population remained stable. This discovery challenges the original hypothesis of "mutational meltdown" for the extinction of wooly mammoths on Wrangel Island. This hypothesis believed that the small isolated population of wooly mammoths had gone extinct due to an accumulation of harmful mutations during inbreeding, leading to the extinction of the woolly mammoths on the island. This study now proposes that the Wrangel Island mammoths were genetically equipped to survive for much longer if external factors had not intervened, leading to the extinction of the population.
I believe it was an excellent original hypothesis about the extinction of the Wrangel Island mammoths, as it makes sense that too many gene mutations occurred during inbreeding. However, with this new evidence proving the original hypothesis wrong, how many other hypotheses about how certain species went extinct are accurate? Understanding these reasons for extinction allows us to understand past ecosystems that used to exist and how they worked; it also allows us to plan accordingly as a species to ensure we are wiped out the same way as other species. So, as we further our research into the extinct species, we should consider multiple factors for the reason for extinction rather than assuming only one genetic factor.
https://www.sciencenews.org/article/last-woolly-mammoths-species-extinct
https://www.snexplores.org/article/why-woolly-mammoths-died-out