I wish people's works were more online—more accessible (preferably, with stable, citable URLs). But to say that the people themselves should be more public in the sense that the author means here is just a continuation-without-lessons-learned of the modern (Facebook and onwards) social networking era.
It's great if all of a person's contributions to, say, mailing lists are preserved and available—and aren't just holes, missing from the record.* That's different from whether or not it's great to be able to click on that person's name, find a profile page for them, and then encounter an exhaustive, reverse chronological feed of all of their activity across all mailing lists. Mailing lists rarely enable this, but virtually every modern social network does, and they're actually built around it.
The former is topic-based indexing, and the latter is actor- (person-) based indexing. Actor-based indexing is bad, and we know that it's bad.
Actor-based indexing is like running into someone you know (or a stranger, even) at the post office and then, through some mechanism where their physical presence wired to some metaverse data source, being able to perform some tap/gesture at the virtualized floating bubble over their heads that lets you see all the public places where you would have seen them earlier that day if you had been at any one of those, and then having a log of every interaction for the day prior, and the day before that, and so on, stretching back over their entire life, including the grocery store, the restaurant, the houseparty they were at, their work, etc. This would be bad. That means it's not good. And it's not good "online", either, for the exact same reasons.
* as unfortunately, many Mastodon (and other ActivityPub-powered) interactions turn out; Mastodon happens to achieve the worst of both worlds!