"if they are on every day prescription, they do not have their period at all for months"
That is verbatim what I wrote. Read: every day prescription. That is a thing. Look up the products for that and what the expected amount of bleeding the users will have after adjusting. If you want to call that bleeding a period or a withdrawal bleeding does not matter. They do not have either.
And since you claimed to know about all this, I took fun in pointing out, that technically, the bleeding is not even a period. Guilty. It is a purely placebo thing. The companies inventing the birth control pills freely admit that. Bleeding is not necessary on birth control. But it was thought to be helpful in introducing the product. Resulting in the myth that monthly bleeding is necessary or that women on birth control still have their periods and statements like this: " old, bad, blood it had been forced to retain"