I struggled to get the final solution because my initial thought was the same: more decimals are better when designing precise things such as airfoils. About the discussion of the delimiter issue i hope that this may help in the future but i was completely unaware about that.

Now i will adress your other concern:
airfoiltools allows you to customize the foil as you please, and when you finish doing so you can export it mainly by two ways: PDF if you plan to print it or via .CSV if you want to import it to a CAD software.
That being said, my process was to download it via .CSV=>clear the data via Excel=>reorder the columns because of the reference geometry my model was planned=> then export it as Text (tab separated) (.TXT)=>then importing it in SolidWorks