I'm not good with PPI or Critic, but my understanding is that it's only parsing legal syntax into tokens, and like demonstrated everything behind the -> is just a string.

But maybe this can help?

C:\>perl -MO=Deparse,-q
print "A $a->meth or $ref->() or $obj->$meth B";
__DATA__
print 'A ' . $a . '->meth or ' . $ref . '->() or ' . $obj . '->' . $me
+th . ' B';
__DATA__
- syntax OK
Terminating on signal SIGINT(2)
[download]

so you could regex the deparsed output, or search the OP-Tree, or probably tell PPI to check for real strings starting with '->'.

HT(probably)H