Huh.

I did actually look at their website but I didn't notice this section. Amongst their manuals this "floating work platform" doesn't get a mention, only their dock.

All of their manuals basically say "observe local safety regulations".

Honestly I feel silly looking this up because this whole set up is so absurd. Anyhow, here is western australia's relevant regulation and it says that Elevated Work Platforms should only be used on solid surfaces on pdf page 37:

Relevant risk control measures when using EWPs should include [...] ensuring the EWP is only used on a solid level surface, unless it is designed for use on rough terrain,

Therefore, using an EWP on a barge is not an appropriate work safe practice.