I mean, what exactly would decoding the string yourself change ? It's not as if b64 decoding has secret malware introspection abilities.

It already decoded the string so I'm not sure what your question is.

There is 0 value in chatgpt telling you "it executes some code". The interesting part would be what is inside the /tmp/... file that the malware intends to execute.

To turn this question around, what did you gain by asking ChatGPT this question? You would have not run this command before, and you wouldn't run it after, and you wouldn't have run it either if ChatGPT told you "yeah it's safe go ahead".

What you would have liked to see is besides the point. Nowhere did the author tell us he was interested in finding out what running the code would do rather than what the string said. So there's no failure here, and the 'right way' people are bringing up here (decoding b64 algorithmically) would produce no more meaningful a result.