Just because he argues that privacy is unsustainable/sub-optimal doesn't mean that he has to facilitate its erosion. It is similar to how someone who demands privacy doesn't need to be prove his anonymity.
"doesn't mean that he has to facilitate its erosion"
It's not facilitating the erosion, it's adding evidence that what he says is backed up by fact, starting with himself. If he does not believe he should follow his own ideals, does he really believe them?
Given the technological improvements, privacy is unsustainable. If everyone realizes this and accepts it, we can reap the benefits of transparency. In a society that does not hold bad actions against those who already paid their due fine (or served the due time). Neither does that future society discriminate against people who are different. In that society, privacy will probably be beneficial only to the dishonest.
Now, I personally don't think if we can reach that stage of maturity, not anytime soon at least. But I think we are moving towards it faster than before and we are doing that because of the easy access to information especially the kind of information that we would otherwise keep private.
I have yet to see a single person who advocates for full transparency post their entire browser and search history, which to me feels odd. If they're advocating for full transparency and yet won't demonstrate that they themselves believe in the ideal enough to offer their own evidence and admission, I don't think they actually believe in those ideals fully, or more likely, have not articulated/discussed/discovered an appropriate middle-ground between these 2 concepts.
With the way society is currently designed, full personal transparency is pretty much social suicide.
Society was designed with some basic expectations of privacy. For example, we rely a lot on passwords and secrets to "prove" ownership and identity. Full transparencies implies that all my private keys, all my passwords, my credit card number, everything that is meant to be private is available to anyone. In a society that relies on no such concept of private knowledge, we wouldn't have this problem. But that's not the case right now.
The example above is just one reason why people shouldn't surrender their privacy just yet, and wait until the environment and context make it convenient. That said, we won't reach that state if we don't realize and accept that privacy is not we should rely on in the future. There are steps to take to make transparency practical and fair, and solutions like the ones mentioned in the above article are not any of them.