That used to be the case. It no longer is. Because the delete button completely blocked that crxid from ever being used again, they didn't communicate that well enough, and some people got themselves in trouble. However, they really should add a hide button. And actually respond to the this mailing list in the first place.
Me neither --
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If Michael or Scott would have paid attention to this thread and the other related thread here: https://groups.google.com/a/chromium.org/forum/#!topic/chromium-apps/3UkyoekLeKE they would have realized that Francois posted a picture of the Delete button from this month, not from back when this was publicly available.