I'm a native speaker but not a grammarian, but I will try to help. " means the speaker is asking whether things are still hectic or not. His friend has said he's still at work; the speaker assumes that things must still be hectic but does not know for sure.
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Delmobile4) I've never heard "is a pedigree," only "has a pedigree."It was my typo.
Delmobile1) "Are they?" means the speaker is asking whether things are still hectic or not.But the question tag "aren't they" actualizes the same, doesn't it?