How do mainland Chinese and non-mainland Chinese people refer to China? With the recent coronavirus outbreak, there has been a lot of information being conveyed in both traditional and simplified Chinese. This is allowing some useful comparative analysis of the tone of voice plus writing style.

I saw something that indicated a direct (Google) translation using software applications or dictionaries, but was wondering if it was a correct usage.

On the traditional Chinese version of the text it said:


  以下建議針對在過去14天內去過中國的人 所有旅行者：
  
  去過中國大陸的人士必須在離開中國後進行自我隔離14天。


And on the simplified Chinese version of the text it said:


  以下建议针对在过去14天内去过中国的人 All travellers所有旅行者：
  
  去过中国大陆的人士必须在离开中国后进行自我隔离14天。


Obviously there is some problem with the translation, but my question is specifically about the use of the term 中國大陸/中国大陆 for both traditional and simplified Chinese as I am sure that there are some issues with this. I believe that there are similar questions in the past, but it would be good if someone is able to clarify this.
How do mainland Chinese and non-mainland Chinese people refer to China?, ...about the use of the term 中國大陸/中国大陆...

Let me first relate an interesting experience.

Many decades ago I was visiting the US via Hawaii. At the Hawaiian airport Immigration counter the officer asked where I was headed, (meaning my ultimate port of call), I answered "the United States" Whoa!, she gave a semi-angry stare and said, "This is the United States" 

Being blessedly born with a nimble mind, I casually answered, "I meant the mainland" This seemed to avoid an unpleasant march to the "briefing room" She stamped my passport and I was on my way to the United States.

Now if this had happened in say, British Hong Kong before "unification", and I said I was on my way to "中國", I don't think the Hong Kong immigration officer would have bated an eyelid. But what if it happens now after unification when, politically, (using this term loosely), Hong Kong is part of 中國 just as Hawaii is part of the United States?

I tell this incident to highlight the fact that such questions and answers could potentially cause misunderstandings. 

Having said that, and as for myself, being a member of the Worldwide Chinese diaspora, I couldn't refer to China as 大陸, which simply means "mainland", just as Continental United States is the Mainland for Hawaii, simply because I am not a citizen of the People's Republic of China living on any number of Chinese territorial islands, like Hong Kong for which mainland China is 大陸, "the Mainland"  

So, for people like me, of Chinese descend whose ancestors left China for Nanyang, (the Southern Seas), generations ago, would simply refer to China as 中国, just like someone from any other country would. 

Of course anyone, including non-Chinese citizens, could refer to the People's Republic of China as 中國大陸/中国大陆 and no one would bate an eyelid, perhaps not even Chinese immigration officers; but I could be wrong of course, depending on the level of "political" understanding of such officers.