Note line 12 of this post https://www.minecraftforum.net/forums/minecraft-java-edition/recent-updates-and-snapshots/2955020-pillager-outposts?comment=4 mad 11Apr19
"Assuming the "and" is a logical one (ie that illager patrols require blocks having BOTH block light <9 AND sky light >9) as well"
yet searching for 'logical' in posts made by ScotsMiser after 01Ap19 returns "No results were found."
Removing the author filter produces four results; none of which are the cited post.
WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.