Of those, the Wallstreet Journal is the one that appears to be guilty of factual inaccuracy, as far as I see. NATO never formally accused Russia, from what I can tell. The Fox piece - yes thats pushing the opinion - but I would point out that it's an opinion piece, by a guest writer - not a news piece. Fox, also ran pieces saying that it was a pro-Ukranian group.
The BBC's report that you linked to seems like worthwhile journalism, reporting on an investigation by Nordic public service broadcasters that Russian naval vessels with transceivers turned off were in the area.
But quotes from that article include:
The cause of the blasts is unclear.
and
In the immediate aftermath, some in the West pointed the finger at Russia, while Moscow blamed Western countries, including the UK.
More recently, there were reports that intelligence pointed towards pro-Ukrainian operatives, although not the Ukrainian government itself.