Does a Will supersede A Life insurance beneficiary clause?

No, They are two separate legal documents with entirely different purposes.

An insurance policy is a contract between the insured and the Insurance company. The insurance company is bound by the contract to pay the beneficiary designated by the insured policy owner. Life insurance proceeds are for the designated beneficiary.

Heirs in a will are designated inheritance of estate by the will. A will is not a contract, it is a document of assignment.