The article is about the changed actual policy deployed with DSM 7.3, that only just started rolling out. Your link hasn’t been updated in over two months, so doesn’t reflect that yet.
In particular: “At the same time, with the introduction of DSM 7.3, 2025 DiskStation Plus series models offer more flexibility for installing third-party HDDs and 2.5" SATA SSDs when creating storage pools. While Synology recommends using drives from the compatibility list for optimal performance and reliability, users retain the flexibility to install other drives at their own discretion.”
I can confirm that if I change my Accept-Language headers in my browser from "en" to "en-US" I get the other version of that page. Actually, for everything else I tried other than "en-US" I get the evil version.
Synology press team Achievement unlocked: Confuse all global IT press outside of the United States.
Edit: Updated KB article is here: https://kb.synology.com/en-us/DSM/tutorial/Drive_compatibili...