Not personally a consumer of RHEL or other binary-compatible distros, so I'm probably out of the loop, but the phrasing of this comes across like Rocky may be less honest than the other companies you have listed. Is this the way it is meant (i.e. have they exhibited dishonest behavior)?
The Rocky Linux team have already been selling support, but previously they could only hope to be an alternative to Red Hat.
With IBM/Red Hat effectively abandoning Open Source, Rocky Linux can step in and position themselves to fill that gap.
This will go down as yet another huge strategic blunder by IBM.