You're incorrect. Employers are allowed to contribute to an employee's 401K plan up to a $53,000 combined limit. The $18K limit applies only to employee contributions.
Unrelated, but Wall Street parasite fees do count towards your contribution limit. And 401k plans mostly offer high fee funds. So be careful or you might think you're contributing $18k but you're actually only contributing $17k and making an annual $1k gift to some some banker's bonus. Also, 401k is a massive Wall Street scam.
