Question regarding tech in lowkeys wr

so i don't know much about speedrunning but i was curious about this tech that i saw in lowkeys rsg wr, when he fills in the eyes at the stronghold he goes into eating animation with the fish he is holding, then, when he enters the end and throws a pearl to get to the main island and is in his inventory he eats the fish without the eating animation being shown? is that real tech sry if this is a stupid question it just looked weird to me