There is a long moment as Kurama waits for the explanation, and then takes his time to work out just how to respond to it. While he could mention that being forthcoming about this information would have solved a world of problems for the fire apparition, this isn't a matter between the small group of them,
anymore .

"So you thought the best way to handle that was to announce it for everyone to see?" He is assuming here that Hiei is going to point out he hadn't actually posted it. Which was kind of his intent, that if Hiei had just admitted the truth to the few people who cared it wouldn't be up on the network for everyone in Aldrip.

Whether that gets heard is, of course, another matter entirely.