Go re-read all the comments here during the take over and layoff where people claimed it could not possibly take more then a handful of people to run such a simple site.
In other words, he destroyed it.
That said, outage frequency did rise following the mass layoffs.
https://www.nytimes.com/2023/02/28/technology/twitter-outage...
Why would you expect the website to stop running though? Keeping a site running with a smaller crew is easy amd baked in - all organizations with >10 engineers do this frequently, over the holidays or Lunar New year. What's harder is building new features at the same pace and quality as a larger engineering team.