In principle, yes. However, this means you need to look at all the information in the sources, and those items that they link to. For example, for one of your grandparents, there is a link to a FamilySearch source which in turn links to a FamilySearch/Family Tree. This has a number of sources which you should review and verify as relevant. If correct, this adds a number of generations to your family.
For the other grandparent whose ancestry is not here, the sources link to Ancestry records, and following up on those may give you suggestions or hints to other sources.
If you create profiles for those it is possible that they could connect to earlier generations on WikiTree.
So, the “in principle, yes” means that information provided here may ultimately lead you to earlier generations. But, expect a bit of work.