False suggestions are valid for many reasons. When you are comparing wikitree profiles to Find A Grave profiles, we don't control the information or sourcing in the grave suggestions, so if it is incorrect and are not changed by that grave page owners, then wikitree suggestions need to be marked as False. Same situation happens with wikidata.
When we have unique names in wikitree because of spelling variations, they are valid suggestions that should be checked, but also marked False if it is a spelling variation needed to avoid duplicates.
There are date variations with no reliable sourcing that can cause suggestions that are marked False.
Personally, I frequently go through the suggestions that are marked False for 571 and 572, as an example, because many people don't understand or don't realize that sameas=no should be used with the template for relatives that don't match the profile. I update the template and then update the suggestions.