I think it is over for The Guardian.
It might be. The real problem, however, is not its insane anti-feminist editorial position, though that has clearly helped it to lose readers. The problem is that its business model has failed entirely. They've put all their print content online, as well as a whole lot of other content, which must be extremely expensive to produce. They don't charge for that content, and they don't attract advertising. Obviously if content is free online, people are going to stop buying the print edition, and when that happens, businesses will stop advertising in the print edition.
So when you have no money from readers, and no money from advertisers, of course you're going to struggle financially. They've managed to break even in the past couple of years by asking people to subscribe voluntarily but it looks as if coronavirus has put the kibosh on that.
The publications that are doing well - notably the Spectator and Private Eye - do so because they have a strong print offering and either don't have much of an online presence, or charge for their online presence. Admittedly these are magazines so it's a slightly different ball game. Nonetheless, as a business model it makes some sense. If I were in Kath Viner's position I'd be scaling back the website and strengthening the print edition, but she seems to be taking the opposite approach.