Maybe the media headlines are sensational (as they always are), and it’s unfortunate that it leaked before the papers were officially released.

But Jupiter emitting radio waves is really not relevant here. The signal they saw is a very arrow frequency, which pretty strongly indicates a technological origin. See [1] for a better overview of the situation.

[1] https://sites.psu.edu/astrowright/2020/12/20/blc1-a-candidat...