There’s working Wayback Machine pages for them, so they’re not completely lost. I’ve also saved just the raw text of most of those pages (I think just the HotS planets I missed and the one not-actually-a-planet article they made for Shakuras). I might just do a pdf of the screenshotted pages though it’d be pretty unflexible in terms of being able to search or do anything with the text. Been super busy with other things sadly so haven’t gotten the chance.
As mentioned though Blackstone is a big frustration since there’s a lot of lore there but it’s all in flash. I preserved the actual text of it in the above archive but it’s pretty dang ugly.