I think any attempt to make a grieving person think their deceased loved one is still accessible is awful. Whether it's "mediums", some idiot fucking with this poor guy, or the guy himself making a hoax about it and therefor planting the idea in other grievers readers' heads... just... no.
True, agonizing, haven't-slept-the-whole-night-in-years grief is a feeling I wouldn't wish upon my worst enemy. The griever needs to move on, and shit like this is making them take a step back. I'm kind of taking it personal I guess. Ugh.