How much Life left for this Sweet Chestnut tree

Hey Guys,
I'm vacationing on the property of a food friend's parents. A few years back they had a tree fall on and damage their roof. Luckily it was the neighbours tree.
Now that the roof is repaired this guy is having me a bit worried. As you can see the trunk has a lot of bark missing and the tree has quite a bit of lean. If it would fall in the direction of lean it would probably mostly miss the roof – but just mostly.
Some branches that would counterbalance the lean were taken off with tree wound goo by my friends father. (I know, probably not the wisest choice).
The tree is still producing rather big fruits but subjectively less than the year(s) before.
What do you guys think about the future of the tree, how much Life is still left in this fella? And what's the risk of a catastrophic failure in a high wind scenario?
The property is in the Alsace region in western France. It's only used for vacation from spring to fall, so if the tree falls nobody would know until possibly months later.

Thanks in advance, I lurk a lot in this sub and have learned quite a bit reading your posts and comments!