Flip Aquatics might be referring to an established tank with 2 times per month. Plus knowing about how to care for a shrimp tank. A stable tank. I can't say what FA is saying.
First off having shrimp in a new tank with out knowing tank parameters is likely to end in death any way.
DO NOT buy more shrimp until you can know what the parameters are.
First problem is new tank is not the best thing for shrimp at all.
Media from an established tank, probably 3 months old media properly cared for. 2 months old media is just getting established bacteria. I f seeded with ammonia fish food or other way one feeds BB to establish a colony.
You may use established media for the new tank. This will seed the tank, not create an instantly cycled tank.
Once a tank is established or you are doing testing in a fish-in cycle, getting a tank ready for shrimp is easy to do using fish living in the tank first.
After around 6 months and keeping the tank stable THEN is a good time to move the fish inhabitants to another tank, give it a light cleaning and start a shrimp tank.
After you now how to care for the tank and how often to clean and haven't had to worry about dangerous or out of safe level ammonia, nitrite and nitrate, you would be best able to keep a successful shrimp tank.
Is there a local fish store which will do testing for free for the tank water?