Sorry, but there's little that's unclear about what he said.
"mixtral medium" is just a typo: he means mistral-medium.
And GPT 4.5 is certainly not an "invention of his". Whether it exists or not (which is debatable, OpenAI said it was just mentioned in a GPT 4 hallutination and caught on), it' s a version name thrown around for like a month in forums, blog posts, news articles and such.
"mixtral medium" is just a typo: he means mistral-medium.
And GPT 4.5 is certainly not an "invention of his". Whether it exists or not (which is debatable, OpenAI said it was just mentioned in a GPT 4 hallutination and caught on), it' s a version name thrown around for like a month in forums, blog posts, news articles and such.