Okay after using this in the campaign a bit, I have noticed a few things.
1) even with invincible mode on, Infantry can still be killed if they are mission critical or take enough damage to kill them outright.

2) with invincible mode on tanks/vehicles arent invincible they lose armor and can break/explode losing infantry in said explosion

3) some buggyness around enemy spawning from the menu, namely from what i have done only infantry waves work, vehicle waves dont. you can still spawn in an enemy vehicle but only in a singularity and not wave(s).

4) when leaving spawn user infantry interface, you are required to scroll up the length of that list to get back to your other options.

5) repair allied armor does not repair damage but functioning armor, only completely broken (hull/turret/tracks). if you have been hit a couple of times and want to remain at full armor you have to get your hull broken to return to full armor.

6) for the story mission where you control a tank, this menu is not an option, especially when it wouldve been helpful as i had run out of ammo by the second half of the mission.

If i notice anything else I will be sure to post. I don't know if these are there intentionally or not so I thought I should post it and ask.