I haven't checked the Guardian in dept, but I believe they towed the same messaging during COVID as any other major Western publication and the same regarding the Russia / Ukraine situation right now.
Alternative voices are to be found on tight corners of the internet, like an individual on Twitter for example.
That doesn't make that much sense, those issues are ones that the Guardian would be aligned with anyway - at least in general. I'm pretty sure I've read disputing opinion pieces on there on both subjects.