Updates on support Linux levels for z/PDT?

[Tim Full]

Have there been any updates since the March 2020 z/PDT Redbook regarding supported (officially or informally) Linux levels for the latest z/PDT drivers?

That doc had
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Linux levels used to build and test zPDT
release. (The “official” levels.)

RHEL 7.7, SLES 12 SP3, Ubuntu 16.04.6 LTS

Informally tested Linux levels
(Earlier levels should used with caution)

RHEL 7.x, 8.0
SLES 12 SP3, 15, openSUSE Leap42.3, 15.0,
Ubuntu 16.04 LTS, 18.04.
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some of which have reached EOL.

From the release guide for 55.12, the following is stated:
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The supported levels of Linux must be at least the 64-bit version of Red Hat Enterprise Linux (RHEL) 7.0 or greater, the 64-bit version of openSUSE Leap 42.3 or greater, the 64-bit version of SLES 12 SP3 or greater, and Ubuntu 16.04 or greater. Earlier versions are not supported.
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which seems pretty generic.

Unless there is something more definitive, I'll probably pursue Ubuntu 20.04 LTS.

Thanks for any feedback.

Tim