FALSE, I just completed the survey via Opera ( the client could not find the Linux beta group lol), the boxes are there and you can use them to select distro and such, you can do it without any Windows or WINE run client, just register a free Steam account and visit the link.
On a different thought, since you register with your ID and they have ID + System Info where they list WINE version and hardware specs, having and ID, having bought games ( important point one might guess

), having run Steam via WINE ( even WINE -git was detected yeah ), might improve your chances to access beta, well I hope.
