Looks like that particular app was last updated before Google Play had updated their policy to prohibit using the accessibility API to record calls. Meaning that app description was probably referring to how Google had removed the API that this developer was using for call recording, when developers had not yet moved onto using the accessibility API workaround.
You don’t have to wait for Izzy to do its thing, which may take days to get an update to you. This will grab from the source directly without a middleman, checking the source however many times per day that you set it to. I guess you could consider Obtainium to be a middleman, but that’s better than relying of Izzy and F-Droid to be your middlemen.
The F-Droid page for any app has a Links section under the app description. Expand that, and the Source Code link is usually the GitHub (or whatever) link you want for the app.
As for update notifications, you set the “Update Checking Interval” in the Obtainium settings (default is every 6 hours). So whenever a new APK gets added to an app’s GitHub, Obtainium will notify you of it the next time it scans for updates.
NewPipe is updated and working again, but not yet Tubular
EDIT: I just got a Tubular update that fixes it