Wrong, they don't cover negligence at all.
They mearly meet the duty to warn so you can't sue because you were not warned of the danger. Negligence is entirely different.
I was looking into this a while back based on another post about waivers and found the information below published by MATTHIESEN, WICKERT & LEHRER, S.C. The document lists information for each state and is current as of 1/5/2021.
It is a much longer article linked here:
https://www.mwl-law.com/wp-content/...ORY-AGREEMENTS-AND-LIABILTY-WAIVERS-CHART.pdf
In at least 46 states, a well-written, properly administered waiver, voluntarily and knowingly signed by an adult, can protect the drafter of the waiver from liability for injuries resulting from ordinary negligence. Not all waivers, however, are well-written and properly administered. Some states, such as Louisiana, Montana, and Virginia, simply refuse to enforce such exculpatory agreements. Twenty (20) states have very strict standards which must be adhered to for an exculpatory agreement to be effective. These include Alaska, Arizona, Arkansas, California, Connecticut, Delaware, Hawaii, Indiana, Kentucky, Maine, Mississippi, Missouri, Nevada, New Hampshire, New Jersey, New York, Pennsylvania, Utah, Vermont, and Wisconsin. Sixteen (16) states have more moderate standards for such an exculpatory clause to be valid. They include Colorado, District of Columbia, Florida, Idaho, Illinois, Iowa, Minnesota, New Mexico, North Carolina, Oklahoma, Oregon, South Carolina, South Dakota, Texas, Washington, and West Virginia. Ten (10) states have very lenient standards and tend to enforce sloppily-drafted exculpatory agreements. They include Alabama, Georgia, Kansas, Maryland, Massachusetts, Michigan, Nebraska, North Dakota, Ohio, and Tennessee. Rhode Island hasn’t clearly defined its requirements and is hard to classify.