You're absolutely correct about admin boundaries not existing on the ground. 

The "ground truth" rule in Israel guidelines is just a reflection of the global OSM rule: https://wiki.openstreetmap.org/wiki/Good_practice#Map_what's_on_the_ground , but I think the way it's formulated in the IL version needs a bit of tweaking.

The MOIN (ministry of interior) had previously given us data in 2011. This is the origin of the boundaries you've edit. Discussion was here: https://community.openstreetmap.org/t/importing-official-administrative-boundaries/53748

I think it's a good idea to check out that that thread, or post a question there, so that the people who were involved can reply.

I think it's entirely plausible the data is freely available outside of govmap, or that govmap would give explicit permission, but I haven't investigated this myself.