No, its not a lot of money for the free supercharging. I just wouldnt expect them to add it, *even if they tell you they will, expect it to not happen*. Thats based on several different people posing here over the past few months. I would love to be proven wrong on this, but I expect this is how your situation will play out:
1. Your friends owner advisor at tesla will tell them "let me check to see if I can add it". They will either come back and say, "sorry, we were unable to add it" or " I gave it to my manager, and they were able to add it".
2. If you were told " we were unable to add it" above, and press, you will eventually get someone to say "Ok we have added it".
3. When delivery comes, your friend will get whatever miles they are entitled to if any by when they ordered, but you wont get anything.
4. When you go to research why you didnt get any 6 months free supercharging for ordering, you will be told by the referral department "if its not ordered through the specific link, there is no referral, sorry".
5. you will be mad, and either come here and post about it, or just be mad at tesla in general, because free supercharging for 6 months is "not a lot of money but they didnt do the right thing".
Note... I am predicting this based on the exact scenario being repeated here by multiple people previously. I am not a tesla hater, or anything close. I love my model 3P, overall best car I have owned, and I have driven exclusively BMWs for a long time before this. On the customer service side, when dealing with someone in PERSON at tesla, its normally a positive, painless experience. When dealing with tesla POLICIES, they change on a whim, and I would not expect any "exception" to actually be accommodated.