Thing is.... if the mission success only decrease slightly for guilds with all ops filled + perfect modding and strategy, CG haven't flat out lied.
They've just done their usual "true, from a certain point of view" communication where most players would read it quite differently from how it is to be understood.
Luckily for me I'm in a guild which shouldn't struggle much with getting all ops filled, but it will be highly detrimental to shard inflow if modding now needs to be perfect coupled with ideal strategy, since lots of players are frankly tired of sitting on streams every other week to do a mission that was previously very possible to do on your own when convenient for you.
The only surprising element here is that CG fixes this now, and not just right after next occurence of GI. I mean, despite their Trello card saying this was discovered internally, the missing tags have been talked about in the community since the launch of the mission.
5 bucks say they weren't aware of the missing GL tag for Kenobi either and will add that because it's been mentioned in these discussions, either now or in the near future.