It's not disingenuous. It's that the assets, even if they were on the scale of Soros's assets, would be insignificant in addressing poverty, which is, as a classic black entrepreneur and motivational speaker wrote, "a disease of the mind."
What's disingenuous is people who know better proposing that the Vatican be dispossessed, à la Henry VIII, as a real-world solution to anything. It seems to have more to do with envy (which is not a virtue) than with a charitable result.
Envy of what?