I agree that from the length of it I would call that an irish bouzouki.
The lower courses are tuned in octaves (easy to see at 5:47) which is more likely on a zouk than an octave-mandolin; but as previously mentioned there aren't any strict rules in tuning and fewer rules in the naming of these things (
https://en.wikipedia.org/wiki/Octave_mandolin)
If a maker makes both the zouk will be longer, but between makers I've seen shorter zouks and longer octave-mandolins.
I got a severe scolding when I referred to mine as an octave-mandola once when I was having a bit of work done to it in a shop her in Oz, so I don't say it anymore. It's apparently named as it's an octave below a mandolin - an octave below a mandola would be a mando-cello.
Anyway they are among the most fun you can have with strings
- and I'm seeing Andy Irvine in a couple of weeks which should be a refresher on how they can get used by someone who knows what they are doing.
Have fun
-sd