Well I wouldn't be keen!
I'm pretty sure if it was ashes scattered then they wouldn't have said buried and actually wouldn't have mentioned it at all.
If it is that patch of mud, it's quite close to the house and in middle isn't it! I wonder if that's linked to the comment about part of the garden being rented from the council - perhaps the burial had to be on the privately owned land? Odd set up, even without the burial.
I did notice the sad items left behind - given the state of it, either there aren't any caring family left to deal with the estate, or they're so annoyed the deceased's wishes have devalued their inheritance they're not bothering to try.