Inaccurate WHV, now applying for Sponsorship.

(Genuinely) asking for a friend. They are a couple currently in Aus on WHVs. For whatever reason was going through their head at the time, they put on the WHV that her partner's only citizenship was UK. This is not true, she is also a Russian citizen and only became a full UK citizen in 2021 (although she had lived in the UK since being a young child). She said they we were worried about prejudice slowing down the process. She now knows how stupid this was, I have made it very clear.

Fast forward to today, their employer is sponsoring them, specifically her partner. So they are in the process of providing everything they need. They have a lawyer helping.

She just messaged me (her form-filling friend, as it's never been her strong suit. I wish she'd have asked me to fill the WHV but never mind...) to ask what they do. And I truly don't know. If they continue without declaring the error and it comes up their sponsorship could be denied. If they reach out to 'correct' the WHV after being there already for 1.5 years the sponsorship could ne denied AND the WHVs themselves could be revoked.

Reddit - what the heck should they do?