My frozen meat never gets moldy.  Meat dries up in the process of freezing and when I take it out the surface is very dry like jerky. It can stay like this in the refrigerator and never gets moldy.

I really like lungs.  Make sure to inspect bronchi for lung worms.  Use a really sharp knife to cut it into small pieces.  I usually keep them semi-frozen.  That way it is easier to cut.

It is standard practice unfortunately.  Even if everything looks good inspector will allow only liver and kidney.  I wish I had a setup to slaughter myself so I could get everything. But I do not.

I am however trying to find some more specific methods as well

One of the trick for regular people is to make green smoothie and add raw liver to it.  That way they do not get most of the taste and none of the texture.

And of course eliminate sugar, grains, alcohol, packaged food, etc.

One of the people I know may have lung cancer, I would be very interested in any advice all of you could give

It depends on what stage it is at.
It depends if this person wants to change his/her life style or not.  Many people will choose to be sick rather than change their old habits.

To cure cancer first thing you need to do is find out the cause. Then eliminate the cause. And last thing fix the immune system so the body can heal itself.

Fixing immune system is a complex process where diet is just one of the components.  If a person has any kind of chronic stress - physical, emotional, chemical, or thermal, no diet will help much.

For example if this person is a smoker he/she needs to quit smoking (most likely primary cause of this cancer), get rid of any chronic stress, cut out consumption of all depressants and stimulants, stop eating all foods that depress immune system (sugar, grain, etc.) and start eating natural diet of nutrient rich food.

And not just tobacco.  Inhaling smoke from any burning vegetation is similarly harmful.

I searched all over and found no evidence that freezing impacts nutrients in any negative way.  When thawing in room temperature some juices may leak and that's about it.

Some people swear they can taste and feel the difference but to me fresh or frozen tastes the same.

https://www.yahoo.com/news/police-defend-decision-not-detain-youtube-shooter-hours-shooting-180740237.html

"Her father called us back to let us know that she made a series of vegan videos for her channel on YouTube and that the company had recently done something to her videos that had caused her to become upset"

Is it possible that in your quest for perfection you are chasing ghosts?  Every year I get Amish beef from the same area and every year it tastes different.  Some are better than the other but it does vary.  I went there to look for myself and all I saw cows grazing 24/7.  Is it possible that every animal has a unique taste?  Dogs did not seem to care about taste difference. They ate all the scraps the same way. 

What about Amish?  Are there any in your area?

Antibiotics is a sure and quickest way.  I would use them in a heartbeat if I was in this situation. Bacterial infections can take a very long time for body to fight.  The benefit of quickly getting rid of infection outweighs all the negatives of antibiotics.

I have not and I will not.  There is no evidence these are stones or anything remotely looks like stones.