Appears that microblog is referring to mastodon content (twitter-like fediverse program). kbin seems to put relevant (unknown mechanism) mastodon content under the microblog tab of a “magazine” (subreddit analog)
I can see it on kbin.social when browsing asklemmy@lemmy.ml, it displays on the "microblog’ tab.
I think kbin works for this better than lemmy.
So, I think Kbin and Lemmy are separate pieces of software operating on the fediverse. But since they speak the same language you can interact cross platform. Interestingly, seems that kbin supports even more fediverse platforms than lemmy. I’ve been able to use kbin to follow mastadon users.
@fox
Also, I can see this at https://lemmy.ml/post/1167451
where its a reddit-style post with the title “@asklemmy”. While on kbin.social it appears more like a twitter post, no title.