No Man's Sky dev reflects on the new Very Positive rating on Steam and promises that this is only the beginning: 'We aren’t even close to being finished yet'

It means they plan to still make many more updates. Not weird IMO.

1.0 is the start of the journey, not the end these days.

I understand where you're coming from but I assume they mean it in a way similar to Minecraft where, officially the game launched 1.0 13 years ago, but they still want to add a lot more to the game. Basically free updates for the foreseeable future which definitely isn't a bad thing.