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That is correct, openGL is no longer supported in this game or CK3.

But to emphasize, the root of the problem is the Intel video hardware, which was never supported in either game under MacOS.
To clarify, OpenGL was never supported for Victoria 3. The game shipped with MoltenVK and there was no change in renderers between patch 1.4.2 and 1.5.x. If the game used to work on that Mac system, but no longer does, it's not a matter of OpenGL to Vulkan switch (it was only a thing in CK3).