This law mentioned in your second link only applies to formulations containing pseudoephedrine, which is used in the production of methamphetamine. Preparations containing DXM, but not pseudoephedrine, are not affected.

The first articles suggests that some pharmacies may only sell drugs containing DXM to adults, but there is no indication that they will be made illegal to obtain or possess at this time. I wouldn't worry about it, if DXM is your thing.