Based on the available information, it is not explicitly stated that an alcohol-free diet can fully repair severe liver damage. However, it is well-established that abstaining from alcohol is a crucial step in managing and improving liver health [1][2].

The liver has the ability to regenerate, and an alcohol-free diet can support this process. A study published in the Journal of Clinical and Translational Hepatology found that lifestyle modifications, including abstinence from alcohol, can lead to improvements in liver function and even reversal of liver damage in some cases [2].

Additionally, a publication from the University of Chicago Medicine emphasizes the importance of a healthy diet in managing fatty liver disease, a condition often associated with alcohol abuse. The article suggests that a balanced diet, along with abstinence from alcohol, can help improve liver health [3].

In conclusion, while an alcohol-free diet cannot be definitively stated to fully repair severe liver damage, it is a critical component of liver health management and can support the liver's natural regenerative process.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/ALCOHOL>
[2] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8041137/>
[3] <https://www.uchicagomedicine.org/forefront/gastrointestinal-articles/2021/september/fatty-liver-disease-diet>