Some new information is still in JH's favor, because I read that the former manager of the landfill took his side and gave him information about where the disk could be located, which could significantly reduce the scope of the search. Given that technology advances every day, it is possible that something will appear that could enable the safe excavation of that waste without endangering the environment and people.
The technology for excavation exists, and the technology for recovering data exists the problem is that there is no technology that would reverse damages that would have been done to that disk.
It's been already 11 years, eleven years of that drive sitting in a landfill (if it hasn't been recycled) in a wet environment, full of every single kind of chemical and the chances of the data being anywhere readable are closer to minus 1 than to zero!

Besides, there is also the possibility that the drive didn't make it to the landfill, maybe someone scavenged it before dumping it and either took it apart or used it, or sold it!