As far as I know, no. Only tests were conducted on template generation. It hasn't been tested in actual combat.

Really? Do you think the idea of creating a mirrored Jebus only came about in 2018?)))) Mirrored templates appeared on Wargames Tavern back in 2009 or 2010. Naturally, the mirrored Jebus appeared around the same time, and they even held a tournament on it... but then they abandoned it.
Mirrored templates appeared in SoD/HotA in 2015. They didn't even hold a tournament then. And why not? Because no matter how hard they tried to create a Jebus map, they always ended up with something that had little to do with the original Jebus and its gameplay. The reason for this was the unstable zone sizes, which couldn't be fixed with the SoD tools. In HotA, they managed to get the sizes close to the original Jebus, but whether this will work out in the long run remains to be seen.