Expedition required!
“However, ground-truthing is the key to remote sensing research. You have to be able to confirm what you are identifying in a satellite image or other type of scene.”
Possibly the kid and his mentors could post the potential expedition online for crowd-sourced funding.
the coordinates of the Maya city, which Gadoury claims is in northern Guatemala, is actually located in southern Campeche, Mexico
These are adjacent geo-political areas in close proximity, with a shared border. Therefore this does not seem to debunk the hypothesis of what was found. The primary importance of this location clarification seems to be a matter of which government would be granting (or withholding) expedition rights.