My two cents,
If anyone tampered with VAT4956 they would have had to modify almost every line of the tablet. I believe that Furuli only questioned few places of the tablet. When you test the lunar observations, the planet observations and the time intervals with a modern astronomy program, you realize that in many cases some of those observations can only happen once every several hundreds of years, especially planetary positions. If just one observation is rare, imagine almost all those observations (more than 30) matching within a very small margin of error for the same year (587/586 BCE). The chances of that tablet corresponding to any year other than 587/586 BCE are tiny at best, even if we take out the "suspicious" places pointed by Furuli. He is as dishonest as the Goberning Body. They know they are wrong, but their continuos lying is easier than admitting they are wrong.