There's literally no mention of indoor temperature in that report. All it says is that more people die in winter than summer - that could be due to all sorts of reasons. We know that viruses spread more in winter because people are indoors - that appears to be the main cause of excess winter death.

It's good practice to use sources which back up your claim, rather than just vaguely talk about the same topic.

I don’t see indoor temperatures discussed anywhere in this report, but yeah, excess mortality during the winter is to be expected.

Some people suffering from debilitating conditions may freeze to death in their homes, but those people weren’t capable of safely living by themselves in the first place.

I’ve lived through the winter in an old building that would barely heat above 17C, it wasn’t great, but I certainly wasn’t freezing all day long.