"Its use is discouraged in favour of using make DESTDIR=${D} install." Should be changed to: "Its use is discouraged in favour of using emake DESTDIR=${D} install."
Except that <automake-1.10 doesn't parallelise install targets correctly.
the topic of broken parallel build systems is not applicable to the PMS src_install should be using `emake install DESTDIR=$D` and if a package is broken, then it gets a bug filed and either it gets fixed or -j1 is used ... like any other parallel build issue
r145 removes all reference of it being discouraged. That's a policy issue, not a specification issue.