The connection finder does indeed show that he is your 28 x great-grandfather. So, he is part of “your” tree to the extent that you are part of the “global tree.” So, from that perspective, there is nothing you need to do.
However, if you look at each generation in the line you will find that many of the connections are uncertain. This means one of several things, the supporting data is weak ( or perhaps non-existent), the data was not critically evaluated, or the person supplying the data failed to click the certain button.
I would look at the data for each generation and evaluate the documentation. If the data is an internet pedigree, such as from Ancestry, without sources, then I would put little faith in the line.
WikiTree shows that I have some lines like this. However, when I examined them, they go through a pedigree that has been disproven. So the lineage evaporates.