Such statements must be taken in context in which it was made.
In this case, covid-19, it is assumed that after 14 days with no symptoms an individual is not infected.
It can also be assumed that the covid-19 virus does not check the citizenship of an individual it is infecting.
Based on these two assumptions, an individual (independent of their citizenship) arriving from an area with a high infection/active rate will be treated differently than someone arriving from an area with a low infection/active rate.
As to what action would then be taken (refusal of entry or quarantine) may be based on citizenship, since citizens (or residents) are generally not refused entry.
A universal definition of what is to be considered high does not exist. For the Schengen Area, this is presently being discussed.
Denmark is introducing a model that is more flexible and easily understandable:
Denmark to further re-open borders and ease travel advice
Effective 27 June, the Danish Government will implement a new model for opening the borders and easing travel advice for countries in the EU and Schengen area, as well as the UK.
To be “open”, a country must have fewer than 20 infected persons per 100,000 inhabitants per week. Once a country is open, the threshold for changing the status to “quarantine country” will be 30 infected persons per 100,000 inhabitants. This policy is designed to prevent opening and closing because of minor fluctuations from week to week. Requirements will also be set for the countries’ testing regimes.
As of today (2020-06-22), 2 countries inside the EU+ area do not fullfill these conditions
- Portugal with 24 (yesterday 23)
- Sweden with 43 (yesterday 49)
Should the Schengen Area decide to adopt the same model, then there would be many countries that would also not fullfill these conditions:
- French Guyana with 408 (yesterday 345)
- Chile with 393 (yesterday 363)
- Brazil with 102 (yesterday 97)
- United States with 55 (yesterday 54)
- Russia with 38 (yesterday 39)
- Mexico with 26 (yesterday 25)