According to the pixiv tags, it certainly is. What's she doing down there, though, I wonder? (As a side note, this also had the yukkuri shiteitte ne tag, lol.)
If you ask me, Hanyuu's sudden appearance has literally "cut short" the comic. Miku will never find her treasure—oh the horror. Hanyuu's "She broke it" points to the bottom of the fourth frame, therefore, which makes sense. Meta-joke is meta.
cut short She broke it. Shovel... shovel... She broke it.