Surveys do not trump everything, only state law trumps everything. Surveys are just evidence to be introduced in court to prove your case, (and they are very good evidence, but not the only evidence). Most people take their own belief system with them wherever they go. Usually this is based (loosely) on their home state's law (or how they wish it was).
And one thing you can always count on is that they will back WHATEVER law, interpretation, whim, wish, fancy, or outright delusion favours them owning more than they do.
Surveyed a PA property to settle an estate, meets and bounds, (terrible system ) btw. 5 adjacent landowners explained why they owned the other Side of various fences.
all five were discredited. How many claimed to be using some of the estate's land??? ZERO. but a couple were in fact doing just that.
I was marking a line for myself and getting screamed at by the neighbour for hanging ribbons from branches, he told me it was impossible to mark a straight line through timber as he couldn't do it, soon as I was done he walked it and tore out every ribbon and nail, next time I used a chainsaw, risky?? yes, Did I smile while cutting, YES I DID...
This particular case most likely will hinge on adverse possession. More details and more lawyers are required.