Total hive winter kill

Hi, first post.
In 2021 we decided to try raising bees, originally just for pollination and to share our plants and uncontrollable Oregano meadow. Our friend recommended we get a Carniolan nuke to start and build a Langstroth hive, sized to accept a flow frame box at a later time if we wanted to.
Things went well, after a swollen nose and ear I bought a good suit, veil, gloves and a smoker. I read up on preparing the hive for winter, they made it through without any problems. Spring of 2022 they were out earlier than I expected and, despite a couple of attacks, things went well. We decided to install the flow frame box. As summer got hotter, the bees would 'beard' on the hive front, I figured the hive was overheating so I added a medium honey box and improved the top cover venting.
Unfortunately, Fall came early. A storm sprung up while we were away for a day and blew the roof off the hive, I didn't think of rain entering the hive, but I'm guessing it did.
Started to notice a lot of dead bees around the hive front after Christmas but I put it down to normal winter kill. Tapped on the hive and heard activity, there was bee poop on the snow, so I figured all was well. The amount of dead bees increased and the hive went quiet.
It took a while for the snow to melt enough that I could take the hive apart. Here's what I found:

These are the frames from the brood box: