Not everyone is at the level 4. I'm waiting until next year to attend. However, I did think of them as I entered my meditation last night.
I hesitated to respond to this question. The answer is yes and no. Yes the blockage is gone, and yes a person can re-create it. Sometimes it takes more than one event to clear the blockage, and the source creating the blockages out forever.
Much of the technique is to speed the removal of blockages, and some of the technique is to direct towards keeping their systems open and not recreating the blockages.
Even Master Lin can not stop people from recreating their own blockages. However, he can enable them to experience a blockage free period. This is usually enough for people to have a belief shift and not recreate the blockage.
I hesitated, because I haven't personally experience the large emotional blockages... or is that the clearance of them. I've experienced a slow and steady belief change. Which is resulting in behavioural changes and a more balanced and flowing life.
Looking at your post yet again, I see the issue of roots of the energy blockages. I wouldn't say that all blockages originate in emotions. My personal belief is that many if not all emotional blockages are created by conscious mental patterns. The origin of the mental patterns may not have been consciously created, but it's the direction of the conscious mind that influences ones qi.
By working at developing a conscious pattern that supports balance and flow one cultivates a healthy blockage free life.
Maybe it was a little off the mark, and a little more about me than your question, but hopefully it came from a single truth and is helpful to you.
You are perfection.
Iam2