Yes, "MPF Payable" is belong to "Accounts Payable" and "Employer MPF Contribution" belong to "Expenses". We did not need "Employee MPF Contribution". See the example below.
Assume the monthly salary of a staff is $50,000. Both the employer contribution and employee contribution are $1,000. So the company will autopay $49,000 to the staff. The company will pay $2,000 to MPF.
Dr Wages & Salaries (expense) 50,000
Dr Employer MPF Contribution (expense) 1,000
Cr Bank (assets) 49,000
Cr MPF payable - Employer (liabilities) 1,000
Cr MPF payable - Employee (liabilities) 1,000