First, this isn't possible to tell with enzymatic tests alone.
Alanine Aminotransferase (aka: ALT) is most commonly associated with the liver, but is found in muscle tissue as well. This level, as you know is about 3 times the normal value, which means there is damage from the alcohol abuse which is causing this enzyme to spill over excessively into the blood.
The Bilirubin is a byproduct of waste management of the liver, excess is associated most famously with jaundice, which will cause yellowing of the skin/eyes etc.. and again, is an insufficient waste management function of the liver.. again indicating damage.
The most telling out of all of this is not the tests, but the history.
5-6 cans of beer a day for 4 years, if honest, shouldn't produce vast damage in an other wise healthy individual. Vodka daily, is quite a different story.
Still, we have 4 years of moderate use/abuse.. and 2 years of a more intense abuse.
This does not a liver transplant make.
The liver is among the most regenerative, if NOT the most regenerative tissue in our body. Followed by the lungs and brain.
You have to remember even if it doesn't repair to 100% where it was pre-abuse.. our livers can function quite well at sub maximum levels. IE: at 75-80% a person can live a lifetime without symptoms. They would just need to be careful with what they consume, specifically medicine and avoid alcohol indefinitely.
Beyond repair.. -- not so simple. It isn't a matter of damage, then fix itself.. done. It is more a cirrhosis process. Literal scarring. Just like you would take a knife and cut your arm or leg over and over.. and it would eventually have quite noticeable scarring the more you did it over the years daily.. the liver does this same process with alcoholism. This fibrous (tough) tissue that develops as a result is very low to non functioning. This is one of the biggest problems, and is 'damage'. The liver attempts to compensate with excess tissue as well, known as fatty liver. This is equal to the scarring,.. this tissue has no beneficial purpose as its internal structure doesn't function.
Beyond ALL of that,.. with history alone I think he has a good prognosis to live a full life if he gets into a 12 step program, gets a sponser (someone to be accountible to),.. and fixes the addiction problem that caused this to begin with. Getting sober is a start, it is technically the 'easy' part.
If he manages to beat his alcoholism, he should be fine.
That said.. he needs a thorough checkup of ALK, ALT, ALB, (a comprehensive metabolic panel essentially) -- with results leading to further testing of the liver such as ultrasound etc. Depending on levels and symptoms.
There is NO doubt that if he lets his liver go without any alcohol for the next year it will be in much better shape than it is now. So he has all the hope in the world to stop things now and push the 'reset' button on life. The big key here, to save his life, is to get help. The most success is AA. I know some people hate the thought of it.. but it works. If he is willing to just surrender that he is an alcoholic and give it a shot.. the right way -- no reservations.. he will likely find it addresses a whole lot more than just "alcohol".
I will leave it at that. I wish him much luck in the future,