I think you may have read that paragraph out of context. The part about moving to the new framework by 2028 applies to people who buy the existing riders between now and Mar 31, 2026.
MOH was referring to new purchasers of the old riders, not long-standing existing policyholders.
For people who already hold the old riders now, MOH said insurers will determine their own approach, and even acknowledged that some insurers may keep the existing terms.
So as of now, there is still no firm decision for existing policyholders. This is why the reporting is confusing, and the article was not written very clearly.