I think you can safely assume that if you had a good reason for travel then I don't think you have anything to worry about. Anyone with an ounce of common-sense would have a company letter on them, for example. I really don't see the problem you are alluding to here, plus a lot of other European states are clamping down at the moment, to take the example of the company letter. But for the quoted section, anyone who insists would probably be arrested, but generally police officers are extremely good at making it clear what the deal is - go home and lick your wounds, or be arrested, either way you wouldn't be travelling, and in that situation only a troublemaker is going to get arrested. What changes "soon" is that responsibility will also fall on airlines to ensure travel is for permitted purposes.

It's a temporary thing, and the more people are sensible the shorter the duration.