This is a little unusual. Most games never explicitly say you need an SSD or a HDD - but Starfield does! This likely isn’t a hard limit, as recommendations are often just that, but I cannot help but wonder what would happen if the game is run on an HDD?
Only other game that I know which has an SSD requirement is star citizen. It’s not really playable with HDD. Then again, it’s not really playable on SSD either, but that’s another can of worms.