This picture shows a sniper moving through the second floor as normal, but I don't believe this can be possibly done in a regular, non-modded match. All snipers are forced to go to a forced and unbreakable special location, and it cannot be interfered.
The user took a picture with a modded HUD, so it is to believe that he/she installed other mods, one which could've been correlated to the groupaitweakdata. Snipers moving as regular units through the map do has been replicated by community mods.
Other than that, I am aware of pre-scripted different difficulty/faction units spawning in BtM, and will probably add as a replacement/update to that trivia.
Regardless, I'll be adding a note of this information on the Perk Deck page. Not the first time OVK has decided to keep hidden stats, whether intentionally or by forgetting it existed on the first place.