The federal channels in the DB are accurate. All the sites and radios are
P25 capable, but its all 99.999999999% analog.
Repeaters (with exception of one or two) are solar/battery powered and low power, but on high points in the park so each area has really good coverage.
The tourist and non-federal commercial services have not been documented very well. As cell mentioned above, there is a move from the regional SMR LTR system to the new NXDN system which is a wide area coverage system that spans WY/ID/MT (Jackson to Idaho Falls to MT). Its a new system so submissions/corrections from what has been submitted is requested.
As for the Wiki entry, its user editable so I cannot attest for its accuracy.