S7 Edge NFC Issue after Battery replacement

Hi.

Long story short, been at a store for battery replacement of my Samsung S7 edge, then NFC is not working since.

I've been back at the store and the guy put the phone on a wireless charger and the phone starts charging therefore the NFC should work since it's on the same module.
Sent a mail to Samsung who send me to a certified repair store where the guy told me (after reacting like it was the first time he was hearing about this phone model) that maybe, and without linspecting it that it was a motherboard issue, circuit burning or something, we should try changing it and MAYBE that'll work.

So now, I got the phone open in front of me and having a look around. I was ready to order an NFC antenna/Charging coil module but then I notice that some areas on it are kinda damaged, like pieces of stickers were "intertwined" with also contact point on the back panel as well ( cf picture).

Those are the only part that seem damaged, so I'm thinking that it might be it? Therefore I might need a new NFC antenna and another backpanel just to get a clean thing on those sitcker/contact point area.

I'm just doing guesswork at this point and really trying to puzzling this NFC thing out to understand how it actually work for me to fix it, which is why I finally throw a bottle into the sea hoping a Master Wikipedia engineer Phone guru passing by.

Thanks a lot for your help.