Looking at the root server hardware page on Hetzner [1], it is not clear if their server is using ECC memory. It would be pretty bad if not.
[1] https://docs.hetzner.com/robot/dedicated-server/general-info...
[1] https://docs.hetzner.com/robot/dedicated-server/general-info...
Go to the product pages
(Yes all the normal Hetzner servers use ECC)
This is wrong - or define "normal"? In their current product line, at least the default configuration of AX52/EX44/EX63/GEX44 doesn't have ECC. It is an upgrade option only.
The blog post says their server has "8 cores Intel Xeon W-2145", which is PX92 or its variant and its base configuration can be without ECC.