As currently proposed, KOSA’s pitch on harm reduction policies come in a few forms:

• Establishing a “duty of care” requirement that would potentially hold social networking companies liable if they fail to filter out abusive or exploitative content for minors
• Ban targeted advertising towards minors
• Stronger default privacy protections for minors

Beyond that, the bill is still in progress. It passed the Senate, but not the House, and it might be dead in the water, so there are no specific implementation details just yet. The point of the article is that legislators are aware of online "platform" games like Roblox, and they are aware that they are exploiting kids. So even if this specific bill doesn't pass, regulation is coming one way or another. It's just a question of whether the industry will self-regulate before the government actually passes something.