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When refreshing an X3 Exadata environment with mostly 18.104.22.168 DB versions running on it, we are wondering if the last gen Exa X8 is a certified platform for a DB version 22.214.171.124
I don't know were you have read this but it is not correct.
For an X8 / X8M Machine you need an minimum Exadata Software Release
From The Database Release running on Exadata Oracle 126.96.36.199 make no sense. Oracle 11.2 is out of Support.
So you should do an Upgrade minimum to Oracle RDBMS Release 12.2.
See below MOS notes for details on Exadata supported version:
Exadata Database Machine and Exadata Storage Server Supported Versions (Doc ID 888828.1)
188.8.131.52 is out of support since 2015, you will get more details about it from below MOS note:
Release Schedule of Current Database Releases (Doc ID 742060.1)
I agree with you that anyone on 184.108.40.206 should migrate sooner than later to a current release. Preferrably to 19c as this is a long term release, but we all know that there a many (real or perceived) obstacles moving from one database release to another. I think one of the main issues is that a software installation (Database, OS, ...) is seen as a one-time task and not a continuous process.
But, support issues aside, looking at the documentation it should still be possible to install Database 220.127.116.11 on Exadata X8 with Exadata software 19.2 (See https://docs.oracle.com/en/engineered-systems/exadata-database-machine/dbmso/new-features-exadata-system-software-releas… and MOS note 2587089.1 for the exact requirements). Is this a good idea? Probably not.
Exadata SW 19.3 finally dropped the ability to install 18.104.22.168 databases on Exadata.