Strange experience roasting a whole chicken from market in Hempstead

This evening I spatchcocked and roasted a whole chicken I picked up from a market in Hempstead this past weekend while on a yearly pumpkin pilgrimage. We decided to stop at a market to grab fruits, veggies, etc. They had what I thought were some nice looking chickens, definitely from a local farmer.

To preface, I’ve roasted chickens this way countless times and they come out wonderful and juicy every time. Except this one. First issue was removing the back bone, typically an easy task, as it was nearly impossible with the trusty poultry shears. It took an immense amount of pressure and sawing. Second, prior to cooking I could already tell the skin was rather thick/leathery and not as pliable. Third, the chicken itself was pretty skinny once I got it out of the bag - breast weren’t big either. Now, after I cooking/pulling it off until my typical doneness with Thermapen, is where it was interesting. The skin, usually my favorite part, was tougher than hell and inedible. The meat throughout was chewy as well - the tender, breast, even the thighs and legs. It was difficult preparing and serving with a chefs knife. Wife and I stopped eating after one of two bites. I saved the rest for a stock.

I am curious…what your thoughts are on this chicken - is it old, diseased, etc? It wasn’t spoiled, boughten fresh and frozen. The fat did have a nice yellow throughout. I’m kinda lost.