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This is the only such "implementation note" in the specification, and it doesn't seem to add anything.
I found this by accident, while trying to write some tooling to extract things from the SYCL specification. This "implementation note" doesn't have the same formatting as other non-normative notes, which broke my tooling. 😄
I originally intended to just fix the admonition block, but I think it would be better to remove this note entirely. Implementers can use SFINAE and/or concepts anywhere they like, and calling this out specifically in the device selector section doesn't seem valuable to me.