As of now, Grey Goose – even regular unflavored vodka – should not be consumed. It has been confirmed by the Chicago CRC and others, that they are using high proof grape alcohol in it. This is a new development and people need to be made aware.
We spoke today to a number of Rabbonim in France. None of them had ever heard this issue before. After further research, it has been confirmed that the plant that produces Grey Goose is actually visited by a local Rov in Europe (name being withheld from public chats). We contacted him directly. He was able to confirm as a matter of fact that Grey Goose does not contain any grape alcohol.
From Rabbi Feigelstock.