Dun need to worry to much if you dun understand CPFB's written english cos sometimes it can be "ambiguous".I really prefer numerical examples then trying to interpret the statements ......
If you have seniors at home, get them to login to CPF, click my cpf, then retirement dashboard, scroll down until you see Topups, it will tell you exactly how much you can topup to current ERS = it is exactly the difference between current year ERS and your current FRS/ERS balance in your RA (excluding interest).
No need to worry, if you do not qualify for topups, you cannot even topup or even exceed what is allowed to your account.