Earth

It's a perfectly valid journalistic choice.

The temporary raising of albedo from eruptions is not relevant since it does not last, it doesn't exist on the relevant time scales. Volcanic cooling does happen (even in recent recorded history!) but it's very short-lived. Any aerosols injected into the atmosphere by volcanism (what is what causes the cooling) typically only lasts for a few years, as a general rule, not more than a decade, while warming from greenhouse gases is persistent and cumulative. It's not something that is worth mentioning as any kind of genuine mitigating factor. Just like the people hoping that nuclear winter from another world war would offset climate change. It won't, it just makes things even more chaotic on a short time scale without actually helping the problem at all on any time scale that matters.

A "volcanic ice age" would be short, maybe nasty, catastrophic for agriculture and civilization, but it would not help us, it wouldn't do anything to solve the underlying problem of anthropogenic warming. Once the aerosols clear, the warming resumes, but now with added CO2 from the eruptions. So yeah, perfectly appropriate that the article doesn't go into that.

(edit: changed the word "lowering" to "raising" which is what I meant - I'm tired.)