Using an eternal stella on AllTheOres hammers (tested on Copper & Iron) would make it seem as if they're indestructible, removing the durability counter, but in reality their durability status isn't affected and they break using the same parameters. (for example 96 uses per iron hammer, tested on several different raw mats turning to dust).

Aight so I've tested this on a couple more seemingly similar stuff (like shears, hoe on dirt, axe in bonsai, etc) and only seems to occur with the AllTheOres hammers. I guess this can be closed now that hammers can't be enchanted with stella with the last update?

yes it can