

Yes, that’s what I thought: It’s just affiliate linking (aka marketing) that any app can use, not a partnership between Heroic and GOG. Thanks for following up and confirming it.
Quoting /u/imLinguin in the post you linked:
Heroic dev here. We are just part of the affiliate program since we help people access GOG on Linux easier. There is nothing more, so there is no need for official announcements from the GOG side.
Most modern SSDs are NVMe devices, so your question doesn’t really make sense.
Do you mean between an HDD and and SSD?
Or maybe a SATA SSD and an NVMe SSD?