Are there any other power rankings for teams other than this one by VLR, like an official ranking for all the teams in the world? Or is VLR the only one thats accurate
Formulaic rankings (like VLR's or Spike's) are calculated using the ELO system, which generally rates people highly for long term consistent success. Nothing is accurate to short term changes, other than expert opinion perhaps, but that is still influenced by personal bias.