This looks to be about enabling the "bricked" (as in not recoverable without external tools, in this case) iPhone to receive the recovery image over wireless connection as an alternative to receiving it over a wire. All of the same protections around needing to be a signed image, a device not on Apples stolen/banned list, and needing to be done from an iPhone already asking for recovery (i.e. it's not some state you push wireless TO the device, it's something it requests and other devices can accept helping with) stay in place regardless if the data is received over a wire or now wirelessly. At most the exploitability change here would be in removing the requirement to have another device connected via cable to execute some set of attacks that break the actual security steps.