If the store accepts digital payments by Bitpay, the goal may be to move away from the inflation of the local currency by obtaining the dollar in the bank account, not the Bitcoin itself.
Bitpay's transfers are made by depositing money into your bank account and then it may be an indirect way to transfer money to them instead of the traditional methods.

I don't know but if they want to keep the bitcoin hiring a tech developer who will set up a payment channel using BTCPay Server would be better.