The English language is scuffed; due to misunderstandings we end up with seemingly opposite words now being used interchangeably to mean the same thing:

• flammable and inflammable, now both usually mean something can be set alight.
• biannual and semiannual, both mean twice a year and once every two years - which is even more confusing.

It’s at the point where if you can’t derive the intended definition from context, you need to ask for clarification! 🤦🏻‍♂️

In this context, I’m pretty sure the commenter was referring to twice-a-month payment. Here in Australia we would call that fortnightly (once every two weeks), where we end up with a scenario where twice a year we end up with 3 payments (for a total of 26 a year). This tends to be more common for hourly wages roles.

It’s been a hot minute since I was paid like that, as corporate salaried positions now tend to be monthly - in order to keep things simple for the HR and Finance teams, and honestly helps people like me to learn/maintain better fiscal responsibility and budgeting.