i think you will find its a procedural generation is output of one system to define which hand-crafted assets to use.
The assets have been designed to dovetail together and mesh coherently so they become their own unique thing,
but at the end of the day the assets still have to be made, and chosen how be sliced up by a human for the procedural generation to cherry pick them.
I'm gonna go out on a limb and predict it won't be as in-depth as this. As much as I'd like that.
That's like the No Man's Sky way where a hand-crafted limb or a bud or a stalk can attach to another hand-crafted body/plant part, thus making up a Frankenstein's organism based on procedural generation. That would be amazing (assuming it fitted the game visually).
But I don't expect them to have achieved that.
Because I think if they had achieved that, there's no way they'd seek to spin that as "these will be hand-crafted, resulting in a high-quality experience".
I think they would be shouting from the rooftops about their new procedural life generator, with the emphasis heavily on the procedural generation rather than the technicality of sub-parts being made from handcrafted assets.
My expectation is a few tens (at best a couple hundred) of base flora types, with some minor procedural variations in colouration, texture, and distribution based on star class, temperature, geography, etc. At absolute best (and probably not as likely), maybe biome-type groupings of assets like grasses procedurally placed alongside weird plants and cacti in a credible and visually-appealing way.
I think we'll be able to sequence two identical looking plants on two different planets and the scans will tell us they have different genomes and just happen to look the same due to their adaptations (hence the comments about "convergent life").
To be honest, I'd be happy enough with that, but if I'm wrong and you're right, then I'll be even happier.