If we were to assume that everyone would just wait until the 15th to do all their amazon orders that they waited a week for then I would agree it’s symbolic.
For many, this will be what happens, but for some, they will find an alternative. Then maybe in the future they chose that alternative too. It’s about gradual progress towards better alternatives. For you, maybe finding ways to make your work less reliant on those things would help. Or if that’s not possible maybe working somewhere else that doesn’t make you sacrifice your values.
As an example, one person choosing to educate themselves on animal welfare might not have much effect today, or tomorrow, or even next week. But after years, even small changes can mean the elimination of suffering for dozens or hundreds of lives.
Seems like a stupid move even from the “I hate trans people” camp.
There are going to be some expensive lawsuits coming from this one regardless of how attractive using cognitive dissonance to pretend trans people don’t exist is to you.