What he is suggesting , is that those people who do use DS4 Windows CAN do more than just re map buttons, over clock or whatever else that are legitimate reasons for using it, so because they can they must be..
Because they CAN he then implies they all DO, so therefore branding all of those remap software programs as cheating.
He also in a later video suggested those programs have been tightly guarded secrets by the top streamers, which really does show his lack of knowledge, they have been around for ages, not guarded and not hidden. Most people don't use them because their configuration can be overwhelming at first look. Also suggesting it takes just one person to know how to use them effectively then selling the scripts.
He only knows how cheats work ( Ex Cheater who got banned, for apparently using the cheats for research only ), so if he can make a cheat do something, then he sees someone doing that very same thing or very similar, they must be using cheats.
Like all the other hacker hunters, he judges people on his own ability, so if they get a kill once in a while they must be cheating.