The "Ships From" variants can be removed from the product, however, at least one country has to be left in that section in order for the product to remain in sync with Oberlo.
To remove the "Ships from" option, go to the product customization page in Shopify admin. From the variants section click on "Edit options" and remove "China" from the country list. By doing this, all variants that include shipping from China will be removed.
However, if you want to keep both "Ships From" values and you don't want your customers to see where the items are shipped from, you can change "Ships From" variant values.
For example, you can change the title of the variant from "Ships from" to "Collection".
Then, change the options from "United States" to "2019".
This is how it will look like on the store.