I'm confused. Can you point me to the specific policy of this party, or other mainstream "far-right" parties who have a remigration policy that specifically excludes the deportation of white people who were not born there?

ICE has deported thousands of white people under the current administration, for instance. Their removal operations are indiscriminate, not racial. Several white people (some from Canada, some from the UK, some from Ireland) have made headline news after getting picked up by ICE ERO.