Every person in this thread understood that Simon meant "Grok, ChatGPT, and other common LLM interfaces run with a temperature>0 by default, and thus non-deterministically produce different outputs for the same query".
Sure, he wrote a shorter version of that, and because of that y'all can split hairs on the details ("yes it's correct for how most people interact with LLMs and for grok, but _technically_ it's not correct").
The point of English blog posts is not to be a long wall of logical prepositions, it's to convey ideas and information. The current wording seems fine to me.
The point of what he was saying was to caution readers "you might not get this if you try to repro it", and that is 100% correct.