You are still incorrect. If the order was issued before the pin, and the unit is in range when it is pinned. It will wind up and throw a molotov. This is not if the molotov is in the air.
To test this play against a comp or friend, order a conscript to molotov a single mg42, and watch it crawl towards the mg. If it gets pinned as it approaches and it is in range you will watch a model light a bottle and then throw it at the mg while the unit is pinned. Even though you did the wrong thing (approached the front of a 42 with 1 squad and let it get pinned) you will force off the mg42.
As a side note I believe this is the same for all grenades and it should not happen for any unit (Ost or Sov). If you get pinned you should have two options: 1) retreat, 2) take your beating.
This is most commonly seen with conscripts because they are often suppressed and crawling towards an mg42 to throw, whereas other units tend to stand off and throw their grenades. Also users are more risk adverse to placing higher value units under pin to release a grenade.
Yes, this is so annoying. I've gotten into the habit of pinning, then immediately repacking the MG and moving further away so I don't get punished for pinning cons, lol so dumb. This and Shocks sitting on your cutoff 2 mins into the game and popping smoke/throwing nades on your MG.....bleh.