I'm sorry but this is not true at all for a number of reasons, the main one I can think of is a concept called Lag Compensation.
Lag compensation was introduced to help counteract the inherent benefits of P2P/Listen Server hosts. Unfortunately some games had very bad implementations of this that actually benefited people with higher latencies more than the actual host. Essentially the host was often "penalized" with artificial lag to level the playing field. That is a crude explanation but basically what happened.
This was widely an issue in several CoD games in the past (maybe even still today, I don't play so I don't know), as well as Destiny 1. Many users, including myself (as much as I hate to admit), used to throttle our upload/download speeds and try to introduce artificial lag on my home network, to avoid gaining host in these games, because we'd have a much better experience than if we were host. With that said, this conversation is essentially moot.
What you are asking NetDuma to do is actively boot people out of an active game session. That would be nearly no different than DDOSing someone so they would lag out of the game and you win, which is rampant on P2P games these days, see Destiny 1 and 2 competitive matches.
Ultimately NetDuma only attempts to prevent bad connections from getting together. It will NEVER negatively affect a gaming session in progress. Doing so would be against the TOS of just about every game there is.