Change whole assembly.
I don't believe in authenticity of this NDE store.. Also he changed name from denso store to NDE store. Toyota makes complete assembly for corolla as far I know. They don't make just filter.
If you want to change filter then buy asakashi brand filter from Partscentral. Or you can ask him to import some good brand filter for you. They can import any part on demand. I recently imported original nuts/bolts of shocks that keeps it with the hub, my old ones were corroding somehow.
I changed just fuel filter at 100k kms and changed complete assembly at 160k kms, but complete assembly change is recommended. I felt that car was way more smoother on oem assembly and filter.