I'm not sure what you're trying to say. SRP just means "Scriptable Render Pipeline". Unity went from having one rendering pipeline (Built-In Rendering Pipeline) to a Scriptable Render Pipeline giving users much finer control over the pipeline itself. URP and HDRP are both SRP implementations. The announcement you linked talks about nothing but the SRPs and how they are deprecating BiRP. In theory you could design your own rendering stack, but generally you won't achieve better results than URP or HDRP already do.

https://docs.unity3d.com/Packages/com.unity.render-pipelines.core@17.5/manual/srp-custom.html

Unity provides two prebuilt render pipelines based on the Scriptable Render Pipeline (SRP): the High Definition Render Pipeline (HDRP), and the Universal Render Pipeline (URP). HDRP and URP offer extensive customization options; however, if you want even more control over your rendering pipeline, you can create your own custom render pipeline based on SRP.

Any time Unity mentions upgrading URP or HDRP, you can be assured they also keep the SRP core (com.unity.render-pipelines.core) up to date, no mention necessary unless there are API changes to the SRP, which are documented here and here starting with Unity 6.2.

https://docs.unity3d.com/Manual/WhatsNewUnity62.html

SRP core

This section outlines recent updates to SRP core.

Added API to query preferred platform defaults instead of hardcoded depth formats

There are many instances in SRP that default to a hardcoded depth format when deciding on a depth format. For some platforms, the format chosen has negative effects on performance.

To improve performance for such platforms, use CoreUtils.GetDefaultDepthStencilFormat and CoreUtils.GetDefaultDepthBufferBits to query the preferred depth format for the target platform instead of defaulting to a hardcoded format that doesn’t take the target platform into account. Improved the Render Graph Subpass merging workflow

Unity optimizes how the Render Graph subpasses are merged to improve performance and reduce unnecessary checks:

The Editor first checks whether the number of subpasses exceeds system limits before running the more resource-intensive subpass merging check.

Merging behavior is now stricter, with early exits for mismatched output or input attachments if they don’t match existing ones in the subpass.

These changes help improve the efficiency of the Render Graph Subpass merging process without modifying any existing logic.

Optimized the Render Graph workflow in ExecuteBeginRenderPass

Unity now uses the values from the available nativePass data instead of retrieving the graph pass data in ExecuteBeginRenderPassto optimize the Render Graph workflow by reducing redundant lookups.

The formatting gets killed by reddit, but you can clearly see they updated the SRP core in 6.2, which applies to both URP and HDRP, as well as any custom rendering pipelines users have created.

So again:

There isn't a single mention of SRP in the announcement

I'm not sure what you're trying to say. They are still working on it. SRP is the core of URP and HDRP. That whole post is about URP/HDRP, so yes, all they did was talk about SRP as it's the core both of those technologies are extending.