Not sure what the author means by "no notes". The transcript they posted does point to both the exact chapters in both the implementation and standard docs:
; See also:
; The SBCL Manual, Node "Package Locks"
; The ANSI Standard, Section 11.1.2.1.2The author here is not saying that the message has no notes. They are saying that they have "no notes" to offer the creators of the message on ways to improve it
See, for example: https://forum.wordreference.com/threads/no-notes.3042292/ https://hinative.com/en-US/questions/15238431 https://www.youtube.com/watch?v=5NVQ8v1P4go
The author was being sincere, rather than sarcastic as your initial parse suggests
This is the section of the standard the error message points at: http://www.lispworks.com/documentation/lw71/CLHS/Body/11_aba...
And this is the reasoning for why that section exists, linked to from that page: http://www.lispworks.com/documentation/lw71/CLHS/Issues/iss2...
"Underestimating the hyperspec" is a persistent mistake on my part sadly, although I at least seem to underestimate it less these days.