It kind of reminds me of the Hannah Fry AI programme where she met a man who had made an AI bot based on his late mother and would talk to it as though it was her. She found it difficult to process, because on the one hand she understood that wish to maintain a connection with the person who has passed and on the other hand she wondered whether it was healthy to postpone the moment of letting go like this. The man maintained it was not hurting anybody and she did agree with that.
I know that's not the same at all, because in that case presumably the man's mother was properly declared dead and either cremated or buried. But it kind of makes me think that probably in that situation, his mother had died in hospital where medical procedures for death would be standardised. And/or there would be siblings, or other family members who were aware of the mother's existence and who would have also wanted to grieve, hold a funeral etc and so would prompt that the usual rituals should take place. Or the man would have people in his life who were aware of his closeness to his mother and might check in with him and offer sympathy when she died.
Those relationships must not have been there in this situation, and I think that isolation is what is sad. Like if MIL died at home, and DH was on the internet ordering a freezer, I'd be like WTF - no - I'm sorry but you cannot keep her in a freezer, this is an insane plan, we need to call a doctor/funeral home/etc because that's the right thing to do. ANYONE would say that.
This man had a gf - did she know about it? Maybe he never invited her to his house but it's so strange, anyway.
I understand the anger about unlawfully claiming benefits but I do think it is missing the point (unless it did turn out to be a plot with the gf). Why is preventing burial even a crime? It's got to be related to the reasons that we even have rituals to deal with bodies in the first place - avoiding health hazards from decomposition, a sense of dignity for the deceased, a general sense that it is wrong/creepy (imagine opening the freezer expecting to find ice cream?) as well as allowing other people the right to grieve/have a grave to visit etc.