Evening Deborah,
I'm not sure where did you get that piece of news from but it's definitely untrue. After purchase of HDB unit, with or without grant, the MOP is 5 years. After which, you are eligible to purchase private property but you might need to set aside CPF minimum sum of $71k, if you have used CPF for your first mortgage loan and intend to use your balance for your second too.
FYI
Mike Lim
96929209 ERA
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