[1] https://radar.cloudflare.com/adoption-and-usage#post-quantum...
Yes, although I wouldn't say "truly" because they haven't intimated that it is. I'm not claiming any malfeasance on Cloudflare's part: they have been very explicit about the fact that the PQ components deployed so far are only in the key exchange. Bas Westerbaan has a great post on the Cloudflare blog about the state of PQ in 2024.
He uses Cloudflare's 33% number as counterevidence against it being hard, and I'm pointing out how this is a selective argument: it was "easy" because nobody, Cloudflare included, considers just PQ key exchange to be a full adoption of PQC. The full adoption requires asymmetric PQC and a corresponding re-imagining of how to encapsulate much larger public keys over the Internet, which is decidedly not easy.
(I don't have opinions on whether QC "won't work" or not; I think it's good to pursue PQC regardless, since we should have more "hard" primitives that don't decompose to the hidden subgroup problem.)
DJB's narrative is a little selective here: Cloudflare has done some incredibly impressive things with post-quantum key agreement, which is arguably the "easy"[1] part of moving the Web PKI/TLS to a PQ setting. But key agreement doesn't tell the parties why they should trust each other; you need signatures and certificates for that, and those will need to be PQ-ready too.
That part is much harder, for both technical (larger certificates implied by most PQ signing schemes are much harder to reliably convey over packet networks) and political (the X.509 ecosystem moves very slowly, and penetration of new signature schemes takes years) reasons.
[1]: Nothing about it is easy.