IIRC it was also heavily focused on Supermicro, without any distinction whether Supermicro was specifically targeted or just happened to supply the boards that were bugged and caught.
[0] eg showing a chip, or ideally the whole motherboard system. Does it actually rewrite instructions going by on MISO or was something else more practical? Parasitic energy harvesting? Inquiring minds want to know!!
No, it's not acceptable if it's a highly-controversial claim in an industry or topic that normally comes with proof of exploitation. They should've got it even if it was independent party vetting it that most would trust who wouldn't give too many details that would compromise an investigation. They could get money and/or advertising for doing the review. Otherwise, present it like it's information coming from anonymous, unvetted sources who could be full of shit.
Remember that anonymous doesn't mean unvetted.
And that leak was over literally millions of lives, so it's not like an intelligence arm of a Nation state doing its job in peace time is so more serious that the standards are higher.
Anonymous certainly doesn't mean unvetted. We should have something come out of the stories if something big is going on, though. If we don't, we have no reason to believe them if the source has other screwups on their record.