I know Andreas and he is reliable and trustworthy. He also publishes binary builds of Previous for macOS x86 and Arm (usually on dropbox). Most of the discussions take place on the nextcomputers.org forums (https://www.nextcomputers.org/forums/), so the handful of people interested in the emulator get their information on updates directly from there and updating the information on the web is often neglected – it's a fun open source project, after all, so I can understand that people prefer to spend their spare time hacking instead of updating web pages. But it's certainly not an ideal situation.

unixdude knows that his webpage is outdated and is working on an update (see the "What Needs to be done for a NeXT Emulator" thread in the Emulation / Virtualization subforum).