It's fair to say that losing internet access doesn't cause you physical harm and won't cause illness or death. In most cases (it's pretty vital for hospitals, for example)

However, i dont believe those criteria should be the only ones used to deem something a necessity or even a basic human right.

It has become almost ubiquitous in the modern world and is almost a barrier for entry for a prosperous life.

It might not be necessary directly to sustaining a human life but it is, at least, indirectly. And at most it is directly necessary for a prosperous one.