For all sorts of tech talk shows, I couldn't get any of the TWiT.tv players (like TWiT Pro or TWiT-stream) working on this device. I then remembered that TWiT also broadcasts live on Twitch, so I installed the Twitch APK, and lo and behold, it works great! I'm seeing lots of other Twitch content too now that's perfect for a device like this.
TWiT also livestreams on YouTube, and the "YouTube Vanced" app works well on this Lenovo. I'm logged into my YT account and have easy access to my subscriptions, playlists and watch history.
Also, for streaming any episode on the TWiT.tv network on-demand, from any of their channels, they publish via RSS, so the Pocket Casts app works great too. For audio as well as video podcasts. NPR Music's long-running "Tiny Desk Concert" series is excellent.
Amazon Prime Video, Amazon Music, NPR One and the PBS app work too! Some great content there for sure. I was NOT, however, successful with Hulu, Paramount+, or HBO Max. I added the working apps to my list above.