Here’s the breakdown of which default iniBuilds Airbuses have had updates in which Sim Update so far:
SU1
SU2
SU3
SU4
SU5
SU6
A400M
X
X
X
X
A310-300
X
X
X
X
X
A320neo
X
X
X
X
A321LR
X
X
X
X
X
A330
X
X
X
X
X
X
Beluga XL
X
X
X
X
X
So it’s true that SU6 brought changes to the smallest number of those aircraft in the fleet, but it’s also true that these changes historically don’t arrive until the final iteration of the Sim Update.
I wouldn’t pass judgement on what changes are or are not being made on these (or any other) aircraft until the final build is released in a few weeks/months. Additionally, iniBuilds staff on their discord and other social media platforms have made it clear that a “significant” update of their default A330s are planned/in-progress, so I wouldn’t call these aircraft abandoned or forgotten personally.