I think everything has settled on /usr/share/metainfo by now. parole.git#master:data/appdata/Makefile.am still uses "appdatadir = $(datadir)/appdata" which should be replaced with "$(datadir)/metainfo". see bug#15341
Sean Davis referenced this bugreport in commit 0254b5f875ab3a1be5ac49816cc1cce2b8c7912b Move appdata to metainfo (bug #15381) https://git.xfce.org/apps/parole/commit?id=0254b5f875ab3a1be5ac49816cc1cce2b8c7912b
Thanks for the report. Fixed in the above commit.