I don't think they are targeted only to them. The short attention span can be a thing, although I'm not sure it's generational. For example, the usual newspaper has a lot of small articles).
On the other hand, part of the candies is to reassure your audience and try to bring them to you with something else than your content. That part applies to everyone, regardless of their age. For example, if you do a blog post on a programming technique, you could try to brand it (and yourself) as "software craftsmanship", insert a few references to people in that space, add a few paragraphs talking mostly about this ideology and not the content. Or you could use a lot of examples, references and jokes from something cultural (the current popular thing on netflix for example). These "candies" aren't targeted at people with short attention span.