the problem with ALL repeater databases, is they are only as reliable as the submissions, and the data base administrators.
Lots of "paper" repeaters exist in my town, especially on UHF. There has been one listed in my home city since the late 1980s that has NEVER existed and NEVER been put on the air, the coordination is even out of the local coordinator's database, but it still shows up in listings on artscipub, the ARRL repeater directory, among other places.
Many repeater owner's don't have the interest, or time, to contact EVERY single DBA and update them with a "status" report of their system. For example, my repeater is currently offline due to a needed feedline replacement and structure upgrade- it's not gone for good- but it's been down for about 9 months. Do you think I have the time (or motivation) to contact EVERY single repeater directory and report this? Do I expect them to "update" their databases in realtime? Some of the sites don't make it particularly easy for us repeater owners to even provide updates on our systems, and it's not like they are "mission critical". Repeaters are not public utilities.
The databases are what they are intended to be, a general guide. Your mileage may very proves very true with these databases.