That's false. The option to opt out of CPF LIFE is available on equal terms to both pink and blue NRIC holders.
But if you want to discuss pink and blue differences, you could do that. Just do it honestly, fairly, and truthfully. For example, pink NRIC holders are eligible for free CPF top ups; blue holders are not. As another example, it's easier for pink NRIC holders to reduce their RA balances to the Basic Retirement Sum if they wish because they enjoy myriad housing preferences including housing grants and lower ABSD rates that blue NRIC holders don't. These differences generally make it easier for them make housing pledges (or have sufficiently large housing charges) so they can drop down to the BRS (if they wish). As yet another example, pink NRIC holders enjoy MediShield Life premium discounts that blue NRIC holders don't, and that it turn makes it more likely their MediSave Accounts will reach (and stay at) the Basic Healthcare Sum, resulting in more SA/RA/OA dollars. (They also pay lower rates for medical care in Singapore's public medical system, reducing MediSave withdrawals and thus increasing net CPF savings.) Pink NRIC holders also enjoy the privilege of indefinite overseas residence and can (after 5 years) opt out of MediShield Life if they wish; blue NRIC holders cannot do any of that.
Both pink and blue NRIC holders can terminate or lose their statuses — and will receive all their CPF savings in a lump sum at that point in time. A pink holder needs to acquire another citizenship, but that's rather easy in many countries. Some foreign citizenships can even be acquired while still in Singapore. The (former) pink NRIC holder does not have to refund any of the CPF-related benefits (lower MediShield Life premiums, free CPF top ups, etc.) that he/she enjoyed while being a Singaporean citizen. The lump sum CPF payout includes those pink-only benefits.