Summary of New per matchup GS Cap league option for 2019 season

Just curious as to what specifically qualifies as a Game Started? Is it truly when a pitcher throws the first pitch in an MLB game? Or is it any pitcher in a SP slot who pitches on a given day? For example, if an MLB team uses its 5th starter in long relief in a blowout game, and that pitcher is in my SP slot on that day, would that count as a Game Started? Conversely, if a pitcher is used as an “opener” and pitches to only two batters and is in my SP slot on that day, would that also count as a Game Started?