There has been some discussion at bug 47954 about when/if Echo should show a diff link to a talk page change.
One suggestion was to link it from the timestamp. Another possibility is to show the diff link when a section link is not available (e.g. it wasn't a section edit).
Version: master
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=47954
https://bugzilla.wikimedia.org/show_bug.cgi?id=46937