Yes, you can interact and see the basic attributes of the MyNextTstat and MyNextAlarm within the new Samsung app since August 22nd if you have the latest versions. You can download the latest versions using your original sellfy download link.
BTW, you cannot instantiate the objects under Things with the new Samsung app, you still need to use the ST classic app to create the devices, but you can view/interact with the devices under the new Samsung app provided that you refresh the cache as indicated in the installation pdf file.
In your case, if your Things are already created, you just need to save and publish the new code (over the existing one) and make sure to refresh the cache (especially on android).