The reason is constituency boundaries are supposed to be reviewed between eight and 12 years. It means if a general election is coming and it is still within that time frame, then no law has been violated. For example, if we went outside 12 years without review, then you can say the election is unconstitutional. It is only after the 2022 General Election that there must be a boundary review. And given that the last time the boundaries were reviewed, even if we go to a general election without new boundaries, there will still be nothing unconstitutional.
Source: The Star July 20, 2021 02:03 UTC