Mass quarantine is likely to be announced suddenly
Something like…
As of 8pm tonight, all supermarkets will be closed and all non-essential travel will be banned. If you need anything like emergency medicines, you must call this number and follow directions. To visit the supermarket, expect to be stopped and inspected by the police or national guard. Leave all your weapons at home. Supermarkets will issue special receipts with a clear timestamp in large bold characters. This is your permission to travel. You must return home within 45 minutes of this time stamp.
In other words, very much like martial law, even though it technically isn't.
The above is my interpretation of the attached tweets. He has been right about everything else he has told us.
P.S. if you are concerned that bad guys could also see his tweets, you haven't yet learned the lesson of Setting the trap. Anything that makes the rats scurry, helps alert police to their whereabouts.
P.P.S. Patriots who think their right to bear arms somehow overrides the authority of the President, may well learn that they do not, in fact, have the right to bear arms as a citizen. Convicts in prison have lost that right because they broke the law. We are returning to rule of law so be civil, be smart, and support the authorities as this crisis unfolds.