https://yourlogicalfallacyis.com/burden-of-proof
Textbook example
It's true that the burden of proof falls on the onr making the claim.
But without evidence its false or true, it's simply unknown.
But the fact the media claimed it to be a hoax without presenting it's origin or creator makes the media untrustworthy.
Yes, there is no proof it's true.
Yes, the burden of proof falls on the claim.
No, not proven true does not make the claim false, it makes to claim baseless.
Yes, claiming something is fake without presenting evidence makes you a liar, just as much as claiming something is true without presenting evidence.
So, yeah the msm is not trustworthy.