yes it's a pellicle. Yes, it's totally safe. It is also likely quite taste. I have a batch pitched with, among other things, some cuvee freddy dregs and it already tastes awesome after about 5 weeks.
How did you decide it was three points from fg? Especially with mixed fermentations you can't really make a determination of what the fg 'should' be. those bugs are going to keep eating what they can until they can't.
but yeah, short answer is it's fine. It's not just lacto though. if you used the cuvee freddy it has a full compliment of bugs in there.
I am using beer smith for my calculations. Was to finish at 1.009. When I checked a week after pitching wlp001, it had dropped to 1.012. I'm new to bugs so it's been an exciting journey.
It sat on bugs for 2 weeks before I racked to secondary, but I have no idea how much is still working in there.
that fg number in beer smith is an estimate and should not be used as a guide. I would be shocked if your true fg on this was higher than 1.003.
Also those flavours are no where near fully developed. Stick this puppy in a dark corner for a few more months and don't worry about it.