they're not saying they're actually going to do this. they're just expressing their wishes and feelings. love is a very strong emotion, wanting to die surrounded by your loved ones is a common thing. consider all the people in the hospital, in hospice, in a nursing home. they usually (not always but sometimes if able to) die with loved ones by their side, holding their hands, etc. so it's not wrong or weird to want to die next to loved ones. it's a very common thing. this person is talking about venerable feelings in probably the only space they can freely share them. several times they stated this is probably not going to happen, so coming in with a toxic and rude attitude is unprecedented. they already feel bad enough no need to make them feel worse.
also. i would like to say i'm so sorry for your loss. i can't imagine how horrible it feels and i get what it feels like to wish you could do something more. it'll be tough but i hope someday you find some peace with yourself, and find some closure.