In the original post, the plan sponsor is willing to give the participant until the end of the year to remedy the situation. This does not sound like a plan sponsor who wants to punish the participant, but does want to enforce the terms of the loan policy. The plan sponsor likely is willing to help the participant work out a solution that does not impact the plan.
If the plan sponsor has lost all faith in the participant's word that it can no longer be trusted, then they likely would terminate the participant's employment.
The plan sponsor does need to enforce the rules lest work get out that anyone can lie and take out a loan for any reason without consequences. This just as easily lead some participants to think other plan or company rules where lying will not have consequences. Or, the plan sponsor could acknowledge that restricting loans is no longer a good idea and remove the restrictions. That is the plan sponsor's decision.
Plans should communicate in writing how the plan will operate, and then operate the plan accordingly. Put in more common language, plans should say what they will do, and then do what they say. Any teacher or parent can tell you that anything else is asking for trouble at some level.