Exec summary for those who think their time is not worth this evil madness:

The only change is that they now allow you to use any 2.5" SATA SSD. Everything else, meaning: 2.5" SATA HDDs (the by far most common thing you would want to use) and NVME SSDs: Still a no-no.

No, there was no lesson learned here by them at all.

The liked article specifically is wrong here:

"Third-party hard drives and 2.5-inch SATA SSDs"

No, not hard drives. 2.5" SSDs only.

Very sorry to spoil the party, but sadly Synology STILL hasn't learned the lesson. :(

Let's check again after they have lost 95% of their customers...