HE peers everywhere they can, so yes I assume you'll see them on AKL-IX too... APE might depend if they see value, last I checked between MegaIX and AKL-IX you collected most of the routes on APE direct or indirect.
To be honest none of the IX's in AKL have been truely domestic for a long time, there's been chunks of AU and other parts of the world, CDNs, global OTTs (Microsoft etc) presenting non NZ routes. This has then flowed into the concept of domestic transit, I've certainly seen bits of international in there a long time.. as did AU when we used to talk about domestic table too (and NZ was always in it!)
Ultimately it's probably a good thing, new names in a market is new competition and even if you don't shop with them you'll probably gain from the market getting a shake.
As a reminder, HE will give you even MORE routes if you bring up a bilateral with them email the peering email @��
https://peeringdb.com/net/291 or talk to Walt from Hurricane.. I'll throw him on the CC as I'm not sure if he's on the list. Maybe he'll visit NZNOG next year.
Gav