I have no doubts the five eyes believe the accusations and have / are mounting their own evidence, but I also don't expect world governments to start condeming or sanctioning India based on hidden evidence because that doesn't sound like a very diplomatic way to procede as a third party country to this fiasco.

Edit: woke up today to articles about indian comms obtained to canada and Biden talking to Modi personally, so it seems we're already developing a little more past the info we had.