It is not a unique timestamp though. Each day, all visitors start at 00:00:00. All users that visit the site a second time get the timestamp 00:00:01 and so on.
Where are people getting these insane reads of GDPR. Any bit of entropy is not going to violate GDPR. First, an active client-server connection is required for any kind supposed "identity" contained here, which would of course include far more unique bits of identity/entropy, such as IP. Secondly, even if the full DB of page view counts were leaked you could not actually use it to identify a user.
You have somehow perverted GDPR to believe it to mean `no client may ever hold a unique state`. Good luck to anyone making a claim that this is NOT possible in anything but the most rudimentary application.