"Even better, it appears the battery isn’t trapped under the logic board. That could mean battery swaps without removing all the brains first—a procedure we’ve been dreaming about for a while."
That...seems like a pretty big improvement?
But I went to check the battery replacement guide for the 2015 and…: https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Retina+Disp...
> Steps 74
> Time Required 2 - 3 hours
However according to the comments the ifixit people were playing it very safe, most of the steps in the first half are not entirely necessary and the procedure can be completed in about an hour.
As to expertise: you just need to remove a few screws and then the power connector, its not difficult just tedious.
You don't have to follow each step, but if you don't know any better you should.
taking shortcuts just leads to sloppy outcomes, like any repair method.
This is why I still feel the fishing line method, combined with low quantities of solvent is the least risky option overall.