Unfortunately, unscrupulous companies can build shadow profiles that bypass cookie and storage based isolation techniques like this.

Your browser gives off a lot of information. See here for some of the information they can use: https://amiunique.org/

You’re best off blocking things with uBlock Origin vs something that just isolates.

No, the cable isn’t going to implement the protocol. You need endpoints that are able to talk that protocol. That might be done with a firmware update or require new hardware.