Resize filter for Apple compressor
The resize filter only takes effect if the image is being resized, which you are not doing, since your export resolution is the same as the input.
E.g neared pixel option.:

Nearest Pixel (Fastest): Samples the nearest neighboring pixel when resizing an image.

In general this setting determines how the pixels are being calculated, e.g. if you resize from 4K to 2.7K or similar.
You can read more about all the settings at apple support.

As mentioned in another post in a comment, I would advise you to ask these video questions in a film/video forum. They will most likely give you more detailed and technical answers than here, since although you are using an Apple product, how to export videos is probably one of the most interesting/most discussed questions, because it determines what the actual audience will be able to see.