Most of the options in Class Feature Variants begin with

"A [CLASSNAME] has access to the following feature" or "A [CLASSNAME] has access to the following features"

And then follow a general trend of referencing class names, feature names, whether it replaces or enhances, and sometimes a level requirement.

For example:

Metamagic Options

3rd-level sorcerer feature (enhances Metamagic)

When you choose Metamagic options, you have access to the following additional options.

How is this type of language supposed to be parsed when using feats that give access to another class' spell lists, metamagic, invocations, etc when you are not the CLASSNAME that was given access?

What if you are the right class but the incorrect level? Such as a variant human using a feat to pick up a class feature before their class would receive the modified version.

How do you interpret the requirements for class feature variants?