I would say that these accusations need more explanation, since there is no way you can really make a reasonable conclusion that your coins will be frozen when LN activates.

In the article they explain how LN works and as you can see with those multisigs, the funds can be locked for a certain amount of time, whichever you wish that time it is. Two weeks is the biggest example in that article. And in those two weeks those funds are locked because they are being used in a LN, where you can spend them on anybody that is inside it. It is really no issue at all, it is a choice on how you want to use it and if you want to use it in the first place. After all, you can just keep using Bitcoin as you were before.