Fish cooking question for today

I usually cook or freeze fresh fish within two days of purchase, so I don't have much experience here.
I found one opinion that says halibut is ok beyond "best buy" date if stored properly. It is based on USDA, FDA, CDC - however much you rely on them these days.
https://stilltasty.com//Fooditems/food_storage_info
But I would hate to suggest safety and have you get sick from too-old fish.
Maybe look at a minimum of three sources and go with a majority viewpoint, or the one you consider most authoritative.

I would toss it. The collective wisdom out there is that halibut is good for 1-2 days after the sell-by date. 5 days later? I wouldn't risk it. ;o)