Unless otherwise indicated separately, Saturday here is generally grouped with the "feriali" and thus part of the work week.
I will update our page with the mass hours to make it more clear and indicate Saturday with the week days.
As you can see from the hours, it says "Monday-Saturday" so the hours are grouped like that.
Sundays and holidays are every other day of the week.
This info is so that it can help you as you navigate through other sites who might not make the distinctions.
So for now I confirm there are Gregorian chants on Saturday and they follow the week day schedule