It says that but the last time I played the remake it felt a bit off here and there. For example you know the monkey threatening the hostage in the foyer? It took many hits to kill it and it still dropped the guy. Just felt a bit off.
I think original gameplay means basically they don't change the genre : it's still "rail shooting" gameplay.
The same can't be said to ... for example .... Final Fantasy VII Remake.
The gameplay was changed from turned-based RPG into action RPG.