Article doesn't mention it, so copypasta from another article:

To access the AltStore PAL’s Mastodon server, users can visit fosstodon.org/@altstore. Meanwhile, users can also discover apps and sources on the AltStore PAL’s explore page at explore.alt.store. Alongside this update, the AltStore PAL app has been updated with an iOS 26 Liquid Glass design and icon.

And note: explore.alt.store is a Mastodon instance.