[basic.stc.dynamic.deallocation] p3 says:

A deallocation function may be an instance of a function template.

and

A template instance is never a usual deallocation function, regardless of its signature.

"instance of a function template" here presumably should just say "function template" to match deallocation functions. Additionally, "template instance" is not a defined term in the standard, presumably it should be "function template specialization".