First of all, do not presume that there is any relationship connecting these data listings simply based on surname similarities. If you want extracted information, LDS shows listings for PARADINE | PARRADINE in the early 1600s in Bedford and Buckingham and a bit later in London. It appears that there are already various family lines at this time. But what matters here is not a bunch of names and dates, it is the relevance to your family ancestry. You must establish that relevance generation to generation. You can’t just pull listings from a hat. Use the census listings and parish register information to establish the when and where of what is known about your oldest generation of ancestors and it’s a go from there. You’ll know Huguenot ancestry when you see it.

As to why 1800, it is, after all, 200 years of genealogy. Obviously someone has to do it and it won’t be them. They have no Huguenot information after 1800, as they say. It is the limit of their database. Just finding a random person in the database with an identical or similar surname simply isn’t good enough, you have to prove that the person actually was one of your ancestors.

Regards,
KA