That's simply not true, because standard level should operate on the IR level, not on the language. You have to generate some IR from your language, at that level it makes sense to talk about standards. The only exception is probably WebGPU where Apple pushed using a fixed language instead of IR which is was a limiting idea.
None of those standards are about IR.
Also SPIR worked so great for OpenCL 2.x, that Khronos rebooted the whole mess back to OpenCL 1.x with OpenCL 3.0 rebranding.
They are pretty much about IR when it comes to language interchange. SPIR-V is explicitly an IR that can be targeted from a lot of different languages.
And so far not much has been happening, hence Shader Languages at Vulkanised 2026.
https://www.khronos.org/events/shading-languages-symposium-2...
These kind of projects is exactly it's happening.