Not sure that is one of their official domains? https://solidtorrents.eu and https://solidtorrents.to seem to be up at the moment - but you’re right their uptime has been spotty.
As an alternative you could always check if https://bitsearch.to is up, that site is run by the same admin and shares the same torrent database AFAIK.
I don’t know if the site admin is around on Lemmy, they are (or used to be) on Reddit.
Is that one definitely scraping bittorrent DHT? From what I can tell it looks like it used for scraping IPFS DHT via HTTP. Been a bit since I tinkered with IPFS but I do know services exist to scrape the IPFS DHT, this might be one of the backend tools being used for that.