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> What is it that the author thinks is particularly unusual about this image?

Read the article and look at the "officially sanctioned" diagram. This looks like the tl;dr of what he things about this:

> Anyway, I’m just surprised the DOE would release any image that gave really any implied graphical structure of a thermonuclear secondary, even if it is clearly schematic and meant to be only somewhat representative. It’s more than they usually allow!

This linked post of his about an earlier redaction mistake also makes it clear (https://blog.nuclearsecrecy.com/2021/05/17/how-not-to-redact...):

> ...but we’re given a rare glimpse inside of modern thermonuclear warheads. Now, there isn’t a whole lot of information that one can make out from these images. The main bit of “data” are the roughly “peanut-shaped” warheads, which goes along with what has been discussed in the open literature for decades about how these sorts of highly-efficient warheads are designed. But the Department of Energy doesn’t like to confirm such accounts, and certainly has never before let us glimpse anything quite as provocative about these warheads. The traditional bomb silhouettes for these warheads are just the dunce-cap re-entry vehicles, not the warheads inside of them.