No, thats the wrong folder path. Don't put in the the Dolphin folder where you run Dolphin from, but under Documents\Dolphin Emulator\Wii
Look at the last section on this page to the actual path: https://dolphin-emu.org/docs/guides/wii-network-guide/#Copying_the_certificates_to_your_Dolphin_folder
Look at the last section on this page to the actual path: https://dolphin-emu.org/docs/guides/wii-network-guide/#Copying_the_certificates_to_your_Dolphin_folder