Yes, I added the link as I did my prose tweaks/review.
A few other notes:
Is the volcano active, dormant, or both? The lead states it is dormant, but then immediately says it is the highest active volcano. I thought the terms were mostly mutually exclusive? If they're not, that should be made clear.
The sentence "Mass movements have left traces..." wikilinks to the political term, which presumably is not what you meant. If there is no article for geological mass movements, the term should be explained in-text as it is otherwise unclear jargon.
I'm not sure what this sentence means: "Ice buried beneath sand and rocks and ice encased in moraines is more important, it is also retreating but the insulating effect of the cover slows the retreat." More important than what? Please rephrase to clarify.
"it did not get much attention from travellers and mountaineers" - this is a little vague. Did not get attention until when? The present? A date in teh past?
"In that year an expedition from Tucumán a mountain south of Ojos del Salado, which they mistook for the volcano." Is this missing some words? I'm not sure what it means - did they measure it?
2a. it contains a list of all references (sources of information), presented in accordance with the layout style guideline.
Pass, no issues.
2b. reliable sources are cited inline. All content that could reasonably be challenged, except for plot summaries and that which summarizes cited content elsewhere in the article, must be cited no later than the end of the paragraph (or line if the content is not in prose).
Pass, no issues, sources are of very high quality.
Quick note: It would be good to include an English translation of the name ("Eyes of salt"? "Eyes from salt"?) in the lead or 'Name' section as appropriate.