Inverted Requirements are Deprecated and is replaced internally by the NOT-Logical Operator. This means that the inverted requirements are automatically converted in-code into a NOT-Operator. Please refrain from using this requirement type, they are still included for Legacy Support!
Inverted requirements are a 1.4.0+ CompatSkills feature only! Inverted requirements are unlocked as long as you do not have the required component. An Inverted Skill Requirement is unlocked as long as you do not have the specified level of the skill or higher.
The Inverted-Syntaxes are as follows:
Example: !adv| !dim| !stage| !skill| !trait| Working Example: !adv|minecraft:husbandry/plant_seed !dim|0 !stage|test !skill|reskillable:building|15 !trait|reskillable:battle_spirit