The key here is in what he didn't say.
None have done so in the last 10 years, but he didn't say that they cannot. The Gahment NEVER closes any doors, but keeps them either ajar or unlocked so they can make a u-turn if necessary. He didn't say they "cannot" but only that none have been approved. Big difference.
However, something I said on here a number of years ago, that was poo-poo'ed at the time by some of the regulars he has now confirmed. (A "I told you so" moment?)
Dr Ng said that according to records, no such persons have been granted re-instatement of PR or citizenship. He added that the policy has been progressively tightened such that no NS-liable PR who renounced his PR status in the last decade has been granted approval for work or study.
For former PRs who fail to serve NS, any immediate or future applications for renewal of their parents' and immediate family members' Re-Entry Permits may be adversely affected, including curtailment of the Re-Entry Permit.